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href="/w/index.php?title=%E7%89%B9%E5%88%A5:%E3%83%AD%E3%82%B0%E3%82%A4%E3%83%B3&returnto=2005" title="ログインすることを推奨します。ただし、必須ではありません。 [o]" accesskey="o" class=""><span>ログイン</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="その他の操作" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="個人用ツール" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">個人用ツール</span> </label> <div 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title="ログインすることを推奨します。ただし、必須ではありません。 [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>ログイン</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> ログアウトした編集者のページ <a href="/wiki/Wikipedia:%E3%82%A6%E3%82%A3%E3%82%AD%E3%83%9A%E3%83%87%E3%82%A3%E3%82%A2%E3%81%B8%E3%82%88%E3%81%86%E3%81%93%E3%81%9D" aria-label="編集の詳細"><span>もっと詳しく</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E8%87%AA%E5%88%86%E3%81%AE%E6%8A%95%E7%A8%BF%E8%A8%98%E9%8C%B2" title="このIPアドレスからなされた編集の一覧 [y]" accesskey="y"><span>投稿記録</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E3%83%88%E3%83%BC%E3%82%AF%E3%83%9A%E3%83%BC%E3%82%B8" title="このIPアドレスからなされた編集についての議論 [n]" accesskey="n"><span>トーク</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="サイト"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="目次" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">目次</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">非表示</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">ページ先頭</div> </a> </li> <li id="toc-性質" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#性質"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>性質</span> </div> </a> <ul id="toc-性質-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-その他_2005_に関連すること" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#その他_2005_に関連すること"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>その他 2005 に関連すること</span> </div> </a> <ul id="toc-その他_2005_に関連すること-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-関連項目" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#関連項目"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>関連項目</span> </div> </a> <ul id="toc-関連項目-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="目次" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="目次の表示・非表示を切り替え" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">目次の表示・非表示を切り替え</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">2005</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="特定の記事の別の言語版に移動します。利用可能な言語8件" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-8" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">8の言語版</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/2005_(sz%C3%A1m)" title="ハンガリー語: 2005 (szám)" lang="hu" hreflang="hu" data-title="2005 (szám)" data-language-autonym="Magyar" data-language-local-name="ハンガリー語" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/2005_(numero)" title="イタリア語: 2005 (numero)" lang="it" hreflang="it" data-title="2005 (numero)" data-language-autonym="Italiano" data-language-local-name="イタリア語" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ko badge-Q70893996 mw-list-item" title=""><a href="https://ko.wikipedia.org/wiki/2005" title="韓国語: 2005" lang="ko" hreflang="ko" data-title="2005" data-language-autonym="한국어" data-language-local-name="韓国語" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-mni mw-list-item"><a href="https://mni.wikipedia.org/wiki/%EA%AF%B2%EA%AF%B0%EA%AF%B0%EA%AF%B5" title="マニプリ語: ꯲꯰꯰꯵" lang="mni" hreflang="mni" data-title="꯲꯰꯰꯵" data-language-autonym="ꯃꯤꯇꯩ ꯂꯣꯟ" data-language-local-name="マニプリ語" class="interlanguage-link-target"><span>ꯃꯤꯇꯩ ꯂꯣꯟ</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/2005_(nombor)" title="マレー語: 2005 (nombor)" lang="ms" hreflang="ms" data-title="2005 (nombor)" data-language-autonym="Bahasa Melayu" data-language-local-name="マレー語" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-pt badge-Q70893996 mw-list-item" title=""><a href="https://pt.wikipedia.org/wiki/Dois_mil_e_cinco" title="ポルトガル語: Dois mil e cinco" lang="pt" hreflang="pt" data-title="Dois mil e cinco" data-language-autonym="Português" data-language-local-name="ポルトガル語" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Elfu_mbili_na_tano" title="スワヒリ語: Elfu mbili na tano" lang="sw" hreflang="sw" data-title="Elfu mbili na tano" data-language-autonym="Kiswahili" data-language-local-name="スワヒリ語" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/2005_(%D8%B9%D8%AF%D8%AF)" title="ウルドゥー語: 2005 (عدد)" lang="ur" hreflang="ur" data-title="2005 (عدد)" data-language-autonym="اردو" data-language-local-name="ウルドゥー語" class="interlanguage-link-target"><span>اردو</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q841374#sitelinks-wikipedia" title="言語間リンクを編集" class="wbc-editpage">リンクを編集</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="名前空間"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/2005" title="本文を閲覧 [c]" accesskey="c"><span>ページ</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=%E3%83%8E%E3%83%BC%E3%83%88:2005&action=edit&redlink=1" rel="discussion" class="new" title="「本文ページについての議論」 (存在しないページ) [t]" accesskey="t"><span>ノート</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="別の言語に切り替える" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">日本語</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="表示"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/2005"><span>閲覧</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=2005&action=edit" title="このページのソースコードを編集する [e]" accesskey="e"><span>編集</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=2005&action=history" title="このページの過去の版 [h]" accesskey="h"><span>履歴表示</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="ページツール"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="ツール" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">ツール</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">ツール</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">非表示</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="その他の操作" > <div class="vector-menu-heading"> 操作 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/2005"><span>閲覧</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=2005&action=edit" title="このページのソースコードを編集する [e]" accesskey="e"><span>編集</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=2005&action=history"><span>履歴表示</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> 全般 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E3%83%AA%E3%83%B3%E3%82%AF%E5%85%83/2005" title="ここにリンクしている全ウィキページの一覧 [j]" accesskey="j"><span>リンク元</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E9%96%A2%E9%80%A3%E3%83%9A%E3%83%BC%E3%82%B8%E3%81%AE%E6%9B%B4%E6%96%B0%E7%8A%B6%E6%B3%81/2005" rel="nofollow" title="このページからリンクしているページの最近の更新 [k]" accesskey="k"><span>関連ページの更新状況</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Wikipedia:%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E3%81%AE%E3%82%A2%E3%83%83%E3%83%97%E3%83%AD%E3%83%BC%E3%83%89" title="ファイルをアップロードする [u]" accesskey="u"><span>ファイルをアップロード</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E7%89%B9%E5%88%A5%E3%83%9A%E3%83%BC%E3%82%B8%E4%B8%80%E8%A6%A7" title="特別ページの一覧 [q]" accesskey="q"><span>特別ページ</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=2005&oldid=75406603" title="このページのこの版への固定リンク"><span>この版への固定リンク</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=2005&action=info" title="このページについての詳細情報"><span>ページ情報</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:%E3%81%93%E3%81%AE%E3%83%9A%E3%83%BC%E3%82%B8%E3%82%92%E5%BC%95%E7%94%A8&page=2005&id=75406603&wpFormIdentifier=titleform" title="このページの引用方法"><span>このページを引用</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:UrlShortener&url=https%3A%2F%2Fja.wikipedia.org%2Fwiki%2F2005"><span>短縮URLを取得する</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:QrCode&url=https%3A%2F%2Fja.wikipedia.org%2Fwiki%2F2005"><span>QRコードをダウンロード</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> 印刷/書き出し </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:%E3%83%96%E3%83%83%E3%82%AF&bookcmd=book_creator&referer=2005"><span>ブックの新規作成</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:DownloadAsPdf&page=2005&action=show-download-screen"><span>PDF 形式でダウンロード</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=2005&printable=yes" title="このページの印刷用ページ [p]" accesskey="p"><span>印刷用バージョン</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> 他のプロジェクト </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:2005_(number)" hreflang="en"><span>コモンズ</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q841374" title="関連付けられたデータリポジトリ項目へのリンク [g]" accesskey="g"><span>ウィキデータ項目</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="ページツール"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="表示"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">表示</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">非表示</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">出典: フリー百科事典『ウィキペディア（Wikipedia）』</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ja" dir="ltr"><table class="infobox bordered" style="width:22em; width:auto"><tbody><tr><th colspan="2" class="" style="text-align:center; font-size:125%; font-weight:bold; white-space:nowrap" itemprop=""><span style="font-size:75%"><a href="/wiki/2004" title="2004">2004</a> <span class="Unicode">←</span></span> 2005 <span style="font-size:75%"><span class="Unicode">→</span> <a href="/wiki/2006" title="2006">2006</a></span></th></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E7%B4%A0%E5%9B%A0%E6%95%B0%E5%88%86%E8%A7%A3" title="素因数分解">素因数分解</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 5×401</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E4%BA%8C%E9%80%B2%E6%B3%95" title="二進法">二進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 11111010101</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E4%B8%89%E9%80%B2%E6%B3%95" title="三進法">三進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 2202021</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E5%9B%9B%E9%80%B2%E6%B3%95" title="四進法">四進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 133111</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E4%BA%94%E9%80%B2%E6%B3%95" title="五進法">五進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 31010</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E5%85%AD%E9%80%B2%E6%B3%95" title="六進法">六進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 13141</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E4%B8%83%E9%80%B2%E6%B3%95" title="七進法">七進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 5563</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E5%85%AB%E9%80%B2%E6%B3%95" title="八進法">八進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 3725</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E5%8D%81%E4%BA%8C%E9%80%B2%E6%B3%95" title="十二進法">十二進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 11B1</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E5%8D%81%E5%85%AD%E9%80%B2%E6%B3%95" title="十六進法">十六進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 7D5</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E4%BA%8C%E5%8D%81%E9%80%B2%E6%B3%95" title="二十進法">二十進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 505</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E4%BA%8C%E5%8D%81%E5%9B%9B%E9%80%B2%E6%B3%95" title="二十四進法">二十四進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 3BD</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E4%B8%89%E5%8D%81%E5%85%AD%E9%80%B2%E6%B3%95" title="三十六進法">三十六進法</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 1JP</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E3%83%AD%E3%83%BC%E3%83%9E%E6%95%B0%E5%AD%97" title="ローマ数字">ローマ数字</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> MMV</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E6%BC%A2%E6%95%B0%E5%AD%97" title="漢数字">漢数字</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 二千五</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E5%A4%A7%E5%AD%97_(%E6%95%B0%E5%AD%97)" title="大字 (数字)">大字</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> 弐千五</td></tr><tr class="" style="" itemprop=""><th scope="row" style="text-align:left; white-space:nowrap; white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em; background:#F2F2F2"><a href="/wiki/%E7%AE%97%E6%9C%A8" title="算木">算木</a></th><td class="" style="white-space:nowrap; vertical-align:middle; padding-left:0.5em; padding-right:0.5em" itemprop=""> <span class="mw-default-size" typeof="mw:File"><a href="/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Counting_rod_h2.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/5/51/Counting_rod_h2.png" decoding="async" width="29" height="13" class="mw-file-element" data-file-width="29" data-file-height="13" /></a></span><span class="mw-default-size" typeof="mw:File"><a href="/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Counting_rod_0.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/5/50/Counting_rod_0.png" decoding="async" width="23" height="23" class="mw-file-element" data-file-width="23" data-file-height="23" /></a></span><span class="mw-default-size" typeof="mw:File"><a href="/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Counting_rod_0.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/5/50/Counting_rod_0.png" decoding="async" width="23" height="23" class="mw-file-element" data-file-width="23" data-file-height="23" /></a></span><span class="mw-default-size" typeof="mw:File"><a href="/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Counting_rod_v5.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/e/e4/Counting_rod_v5.png" decoding="async" width="31" height="29" class="mw-file-element" data-file-width="31" data-file-height="29" /></a></span></td></tr></tbody></table> <p><b>2005</b>（<b>二千五</b>、<b>二〇〇五</b>、にせんご）は、<a href="/wiki/%E8%87%AA%E7%84%B6%E6%95%B0" title="自然数">自然数</a>また<a href="/wiki/%E6%95%B4%E6%95%B0" title="整数">整数</a>において、<a href="/wiki/2004" title="2004">2004</a>の次で<a href="/wiki/2006" title="2006">2006</a>の前の数である。 </p> <div class="mw-heading mw-heading2"><h2 id="性質"><span id=".E6.80.A7.E8.B3.AA"></span>性質</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=2005&action=edit&section=1" title="節を編集: 性質"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>2005 は<a href="/wiki/%E5%90%88%E6%88%90%E6%95%B0" title="合成数">合成数</a>であり、<a href="/wiki/%E7%B4%84%E6%95%B0" title="約数">約数</a>は <a href="/wiki/1" title="1">1</a>, <a href="/wiki/5" title="5">5</a>, <a href="/wiki/401" title="401">401</a>, 2005 である。 <ul><li><a href="/wiki/%E7%B4%84%E6%95%B0%E3%81%AE%E5%92%8C" class="mw-redirect" title="約数の和">約数の和</a>は2412。</li></ul></li> <li>578番目の<a href="/wiki/%E5%8D%8A%E7%B4%A0%E6%95%B0" title="半素数">半素数</a>である。1つ前は<a href="/wiki/1994" title="1994">1994</a>、次は<a href="/wiki/2018" title="2018">2018</a>。</li> <li><a href="/wiki/%E5%90%84%E4%BD%8D%E3%81%AE%E5%92%8C" class="mw-redirect" title="各位の和">各位の和</a>が7になる65番目の数である。1つ前は<a href="/wiki/1600" title="1600">1600</a>、次は<a href="/wiki/2014" title="2014">2014</a>。</li> <li>2005 = 18<sup>2</sup> + 41<sup>2</sup> = 22<sup>2</sup> + 39<sup>2</sup> <ul><li>異なる2つの<a href="/wiki/%E5%B9%B3%E6%96%B9%E6%95%B0" title="平方数">平方数</a>の和で表せる571番目の数である。1つ前は<a href="/wiki/2000" title="2000">2000</a>、次は<a href="/wiki/2009" title="2009">2009</a>。(<a href="/wiki/%E3%82%AA%E3%83%B3%E3%83%A9%E3%82%A4%E3%83%B3%E6%95%B4%E6%95%B0%E5%88%97%E5%A4%A7%E8%BE%9E%E5%85%B8" title="オンライン整数列大辞典">オンライン整数列大辞典</a>の数列 <a rel="nofollow" class="external text" href="//oeis.org/A004431">A004431</a>)</li> <li>2つの<a href="/wiki/%E5%B9%B3%E6%96%B9%E6%95%B0" title="平方数">平方数</a>の和2通りで表せる145番目の数である。1つ前は<a href="/wiki/2000" title="2000">2000</a>、次は<a href="/wiki/2020" title="2020">2020</a>。</li></ul></li> <li>3つの<a href="/wiki/%E5%B9%B3%E6%96%B9%E6%95%B0" title="平方数">平方数</a>の和7通りで表せる91番目の数である。1つ前は<a href="/wiki/1976" title="1976">1976</a>、次は<a href="/wiki/2018" title="2018">2018</a>。(<a href="/wiki/%E3%82%AA%E3%83%B3%E3%83%A9%E3%82%A4%E3%83%B3%E6%95%B4%E6%95%B0%E5%88%97%E5%A4%A7%E8%BE%9E%E5%85%B8" title="オンライン整数列大辞典">オンライン整数列大辞典</a>の数列 <a rel="nofollow" class="external text" href="//oeis.org/A025327">A025327</a>)</li> <li>2005 = 3<sup>3</sup> + 5<sup>3</sup> + 5<sup>3</sup> + 12<sup>3</sup> <ul><li>4つの正の数の<a href="/wiki/%E7%AB%8B%E6%96%B9%E6%95%B0" title="立方数">立方数</a>の和で表せる626番目の数である。1つ前は<a href="/wiki/2002" title="2002">2002</a>、次は<a href="/wiki/2009" title="2009">2009</a>。(<a href="/wiki/%E3%82%AA%E3%83%B3%E3%83%A9%E3%82%A4%E3%83%B3%E6%95%B4%E6%95%B0%E5%88%97%E5%A4%A7%E8%BE%9E%E5%85%B8" title="オンライン整数列大辞典">オンライン整数列大辞典</a>の数列 <a rel="nofollow" class="external text" href="//oeis.org/A003327">A003327</a>)</li></ul></li></ul> <div class="mw-heading mw-heading2"><h2 id="その他_2005_に関連すること"><span id=".E3.81.9D.E3.81.AE.E4.BB.96_2005_.E3.81.AB.E9.96.A2.E9.80.A3.E3.81.99.E3.82.8B.E3.81.93.E3.81.A8"></span>その他 2005 に関連すること</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=2005&action=edit&section=2" title="節を編集: その他 2005 に関連すること"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/%E3%83%95%E3%82%A7%E3%83%A9%E3%83%BC%E3%83%AA%E3%83%BBF2005" title="フェラーリ・F2005">フェラーリ・F2005</a>は、<a href="/wiki/%E3%82%B9%E3%82%AF%E3%83%BC%E3%83%87%E3%83%AA%E3%82%A2%E3%83%BB%E3%83%95%E3%82%A7%E3%83%A9%E3%83%BC%E3%83%AA" title="スクーデリア・フェラーリ">スクーデリア・フェラーリ</a>の<a href="/wiki/%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9F%E3%83%A5%E3%83%A91%E3%82%AB%E3%83%BC" title="フォーミュラ1カー">フォーミュラ1カー</a>。</li></ul> <div class="mw-heading mw-heading2"><h2 id="関連項目"><span id=".E9.96.A2.E9.80.A3.E9.A0.85.E7.9B.AE"></span>関連項目</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=2005&action=edit&section=3" title="節を編集: 関連項目"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/%E6%95%B0%E3%81%AB%E9%96%A2%E3%81%99%E3%82%8B%E8%A8%98%E4%BA%8B%E3%81%AE%E4%B8%80%E8%A6%A7" title="数に関する記事の一覧">数に関する記事の一覧</a></li> <li><a href="/wiki/2005%E5%B9%B4" title="2005年">西暦2005年</a></li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">「<a dir="ltr" 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