CINXE.COM
The On-Line Encyclopedia of Integer Sequences (OEIS)
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <html> <head> <link rel="stylesheet" href="/styles.css"> <meta name="format-detection" content="telephone=no"> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <meta name=viewport content="width=device-width, initial-scale=1"> <meta name="keywords" content="OEIS,integer sequences,Sloane" /> <title>The On-Line Encyclopedia of Integer Sequences (OEIS)</title> <link rel="search" type="application/opensearchdescription+xml" title="OEIS" href="/oeis.xml"> <script> var myURL = "\/" function redir() { var host = document.location.hostname; if(host != "oeis.org" && host != "127.0.0.1" && !/^([0-9.]+)$/.test(host) && host != "localhost" && host != "localhost.localdomain") { document.location = "https"+":"+"//"+"oeis"+".org/" + myURL; } } function sf() { if(document.location.pathname == "/" && document.f) document.f.q.focus(); } </script> </head> <body bgcolor=#ffffff onload="redir();sf()"> <div class=loginbar> <div class=login> <a href="/login?redirect=%2f">login</a> </div> </div> <div class=center><div class=top> <center> <div class=donors> The OEIS is supported by <a href="http://oeisf.org/#DONATE">the many generous donors to the OEIS Foundation</a>. </div> <div class=banner> <a href="/"><img class=banner border="0" width="600" src="/banner2021.jpg" alt="The On-Line Encyclopedia of Integer Sequences (OEIS)"></a> </div> <div class="motdbox"> <div class="motd"> <p>Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).</p> </div> <div class="donate"> <div id="donate-button-container"> <div id="donate-button"></div> <script src="https://www.paypalobjects.com/donate/sdk/donate-sdk.js" charset="UTF-8"></script> <script> PayPal.Donation.Button({ env:'production', hosted_button_id:'SVPGSDDCJ734A', image: { src:'https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif', alt:'Donate with PayPal button', title:'PayPal - The safer, easier way to pay online!', } }).render('#donate-button'); </script> </div> <a href="https://oeisf.org/donate/"> <strong>Other ways to Give</strong> </a> </div> </div> </center> </div></div> <div class=center><div class=pagebody> <center> <h1>The On-Line Encyclopedia of Integer Sequences (OEIS)</h1> <div class=frontsearchbox> <span dir="LTR"> <form name=f action="/search" method="GET"> Enter a sequence, word, or sequence number:<br> <p> <input id=q maxLength=1024 dir="LTR" name=q value="1,2,3,6,11,23,47,106,235" title="Search Query"> <input type=hidden name=language value="english"> <p> <input type=submit value="Search" name=go> <a href="hints.html">Hints</a> <a href="/wiki/Welcome">Welcome</a> <a href="https://www.youtube.com/watch?v=vKPRRUWbWAQ">Video</a> </form> </span> </div> <div class=allinenglish> <p><span dir="LTR"><!-- All the pages which follow are in English. --></span><p> </div> <div class=welcometext> <p><span dir="LTR">For more information about the Encyclopedia, see the <a href="/wiki/Welcome">Welcome</a> page.</span></p> </div> <div class=languages> <a href="translate.html" class=translate>Languages</a>: <span><a href="/?language=english" title="English">English</a></span> <span><a href="/?language=albanian" title="Albanian">Shqip</a></span> <span><a href="/?language=arabic" title="Arabic">العربية</a></span> <span><a href="/?language=bengali" title="Bengali">Bangla</a></span> <span><a href="/?language=bulgarian" title="Bulgarian">Български</a></span> <span><a href="/?language=catalan" title="Catalan">Català</a></span> <span>中文 (<a href="/?language=chinese" title="Chinese (traditional)">正體字</a>, <a href="/?language=chineseS" title="Chinese (simplified 1)">简化字 (1)</a>, <a href="/?language=chineseT" title="Chinese (simplified 2)">简化字 (2)</a>)</span> <span><a href="/?language=croatian" title="Croatian">Hrvatski</a></span> <span><a href="/?language=czech" title="Czech">Čeština</a></span> <span><a href="/?language=danish" title="Danish">Dansk</a></span> <span><a href="/?language=dutch" title="Dutch">Nederlands</a></span> <span><a href="/?language=esperanto" title="Esperanto">Esperanto</a></span> <span><a href="/?language=estonian" title="Estonian">Eesti</a></span> <span><a href="/?language=farsi" title="Farsi">فارسی</a></span> <span><a href="/?language=finnish" title="Finnish">Suomi</a></span> <span><a href="/?language=french" title="French">Français</a></span> <span><a href="/?language=german" title="German">Deutsch</a></span> <span><a href="/?language=greek" title="Greek">Ελληνικά</a></span> <span><a href="/?language=gujarati" title="Gujarati">ગુજરાતી</a></span> <span><a href="/?language=hebrew" title="Hebrew">עברית</a></span> <span><a href="/?language=hindi" title="Hindi">हिंदी</a></span> <span><a href="/?language=hungarian" title="Hungarian">Magyar</a></span> <span><a href="/?language=igbo" title="Igbo">Igbo</a></span> <span><a href="/?language=indonesian" title="Indonesian">Bahasa Indonesia</a></span> <span><a href="/?language=italian" title="Italian">Italiano</a></span> <span><a href="/?language=japanese" title="Japanese">日本語</a></span> <span><a href="/?language=kannada" title="Kannada">ಕನ್ನಡ</a></span> <span><a href="/?language=korean" title="Korean">한국어</a></span> <span><a href="/?language=lithuanian" title="Lithuanian">Lietuvių</a></span> <span><a href="/?language=marathi" title="Marathi">मराठी</a></span> <span><a href="/?language=norwegianB" title="Norwegian (Bokmål)">Bokmål</a></span> <span><a href="/?language=norwegianN" title="Norwegian (Nynorsk)">Nynorsk</a></span> <span><a href="/?language=polish" title="Polish">Polski</a></span> <span><a href="/?language=portuguese" title="Portuguese">Português</a></span> <span><a href="/?language=romanian" title="Romanian">Română</a></span> <span><a href="/?language=russian" title="Russian">Русский</a></span> <span><a href="/?language=serbian" title="Serbian">Српски</a></span> <span><a href="/?language=slovenian" title="Slovenian">Slovenščina</a></span> <span><a href="/?language=spanish" title="Spanish">Español</a></span> <span><a href="/?language=swedish" title="Swedish">Svenska</a></span> <span><a href="/?language=tagalog" title="Tagalog">Tagalog</a></span> <span><a href="/?language=thai" title="Thai">ภาษาไทย</a></span> <span><a href="/?language=turkish" title="Turkish">Türkçe</a></span> <span><a href="/?language=ukrainian" title="Ukrainian">Українська</a></span> <span><a href="/?language=urdu" title="Urdu">اردو</a></span> <span><a href="/?language=vietnamese" title="Vietnamese">Tiếng Việt</a></span> <span><a href="/?language=welsh" title="Welsh">Cymraeg</a></span> </div> </center> </div></div> <p> <div class=footerpad></div> <div class=footer> <center> <div class=bottom> <div class=linksbar> <a href="/">Lookup</a> <a href="/wiki/Welcome"><font color="red">Welcome</font></a> <a href="/wiki/Main_Page"><font color="red">Wiki</font></a> <a href="/wiki/Special:RequestAccount">Register</a> <a href="/play.html">Music</a> <a href="/plot2.html">Plot 2</a> <a href="/demo1.html">Demos</a> <a href="/wiki/Index_to_OEIS">Index</a> <a href="/webcam">WebCam</a> <a href="/Submit.html">Contribute</a> <a href="/eishelp2.html">Format</a> <a href="/wiki/Style_Sheet">Style Sheet</a> <a href="/transforms.html">Transforms</a> <a href="/ol.html">Superseeker</a> <a href="/recent">Recents</a> </div> <div class=linksbar> <a href="/community.html">The OEIS Community</a> </div> <div class=linksbar> Maintained by <a href="http://oeisf.org">The OEIS Foundation Inc.</a> </div> <div class=dbinfo>Last modified December 11 22:42 EST 2024. Contains 378629 sequences.</div> <div class=legal> <a href="/wiki/Legal_Documents">License Agreements, Terms of Use, Privacy Policy</a> </div> </div> </center> </div> </body> </html>