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id="siteSub">From OeisWiki</div> <div id="contentSub"></div> <div id="jump-to-nav" class="mw-jump">Jump to: <a href="#column-one">navigation</a>, <a href="#searchInput">search</a></div> <!-- start content --> <div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><div class="mw-parser-output"><p><a href="/wiki/Editorial_Board" title="Editorial Board">Editor-in-Chief</a>, interested primarily in computational number theory and allied fields. </p><p>I can be contacted via my Talk page here, or by <a href="/wiki/Special:EmailUser/Charles_R_Greathouse_IV" title="Special:EmailUser/Charles R Greathouse IV">email</a>. </p> <table> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Averages" title="User:Charles R Greathouse IV/Averages">User:Charles R Greathouse IV/Averages</a> </td> <td> Early draft of an article. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Chase_sequences" title="User:Charles R Greathouse IV/Chase sequences">User:Charles R Greathouse IV/Chase sequences</a> </td> <td> 'Chase sequences': Axxxxxx refers to Ayyyyyy, which refers to Azzzzzz... </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Classifying_numbers" title="User:Charles R Greathouse IV/Classifying numbers">User:Charles R Greathouse IV/Classifying numbers</a> </td> <td> Classifying constants in the OEIS as rational, algebraic, or transcendental. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Favorites" title="User:Charles R Greathouse IV/Favorites">User:Charles R Greathouse IV/Favorites</a> </td> <td> Some of my favorite sequences. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Format" title="User:Charles R Greathouse IV/Format">User:Charles R Greathouse IV/Format</a> </td> <td> Discusses the correct format of b-files and how to repair ill-formatted b-files. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Junk" title="User:Charles R Greathouse IV/Junk">User:Charles R Greathouse IV/Junk</a> </td> <td> Disreputable publishers, journals, etc. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Keywords" title="User:Charles R Greathouse IV/Keywords">User:Charles R Greathouse IV/Keywords</a> </td> <td> Information on keywords: when to use them, new ones to add, etc. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Metadata" title="User:Charles R Greathouse IV/Metadata">User:Charles R Greathouse IV/Metadata</a> </td> <td> Plans for OEIS metadata: keywords, categories, the index, etc. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Pari" title="User:Charles R Greathouse IV/Pari">User:Charles R Greathouse IV/Pari</a> </td> <td> Some PARI/GP tools. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Programs" title="User:Charles R Greathouse IV/Programs">User:Charles R Greathouse IV/Programs</a> </td> <td> Programs in the OEIS: types, format, etc. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Projects" title="User:Charles R Greathouse IV/Projects">User:Charles R Greathouse IV/Projects</a> </td> <td> Other mathematical databases, fingerprint databases, and similar projects </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Properties" title="User:Charles R Greathouse IV/Properties">User:Charles R Greathouse IV/Properties</a> </td> <td> Sequence properties and classes </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Rule_of_thumb" title="User:Charles R Greathouse IV/Rule of thumb">User:Charles R Greathouse IV/Rule of thumb</a> </td> <td> Sequences should take 1 hour to prepare for submission. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Standards" title="User:Charles R Greathouse IV/Standards">User:Charles R Greathouse IV/Standards</a> </td> <td> How to write up certain kinds of sequences. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Tables_of_special_primes" title="User:Charles R Greathouse IV/Tables of special primes">User:Charles R Greathouse IV/Tables of special primes</a> </td> <td> Types of primes and their densities </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/To_do" title="User:Charles R Greathouse IV/To do">User:Charles R Greathouse IV/To do</a> </td> <td> Sequences to work on and b-files to fix. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Vanity" title="User:Charles R Greathouse IV/Vanity">User:Charles R Greathouse IV/Vanity</a> </td> <td> Sequences named after their discoverer. </td></tr> <tr> <td> <a href="/wiki/User:Charles_R_Greathouse_IV/Wiki" title="User:Charles R Greathouse IV/Wiki">User:Charles R Greathouse IV/Wiki</a> </td> <td> Tools for the OEIS wiki. </td></tr> </table> <p>Projects: </p> <ul><li><a href="/wiki/Historical_sequences" title="Historical sequences">Historical sequences</a></li> <li><a href="/wiki/The_multi-faceted_reach_of_the_OEIS" title="The multi-faceted reach of the OEIS">The multi-faceted reach of the OEIS</a></li> <li><a href="/wiki/Sequences_determined_by_prime_signature" title="Sequences determined by prime signature">Sequences determined by prime signature</a></li></ul> <p>Useful links: </p> <ul><li><a href="/wiki/Features_Wishlist" title="Features Wishlist">Features Wishlist</a>, <a href="/wiki/User:Russ_Cox/OEIS_Server_Features" title="User:Russ Cox/OEIS Server Features">User:Russ Cox/OEIS Server Features</a>, <a href="/wiki/Suggested_Projects" title="Suggested Projects">Suggested Projects</a></li> <li><a href="/wiki/Deleted_sequences" title="Deleted sequences">Deleted sequences</a> (<a rel="nofollow" class="external text" href="https://oeis.org/w/index.php?title=Deleted_sequences&action=edit&section=4">most recent month</a>)</li> <li><a href="/wiki/Suggested_pre-submit_checklist" title="Suggested pre-submit checklist">Suggested pre-submit checklist</a></li> <li><a href="/wiki/Requested_articles" title="Requested articles">Requested articles</a></li> <li>Editing history: <a rel="nofollow" class="external text" href="http://oeis.org/history?user=Charles%20R%20Greathouse%20IV">sequence</a>, <a href="/wiki/Special:Contributions/Charles_R_Greathouse_IV" title="Special:Contributions/Charles R Greathouse IV">wiki</a></li> <li> References on proof attempts: <a rel="nofollow" class="external text" href="http://www.win.tue.nl/~gwoegi/P-versus-NP.htm">P vs. NP</a>, <a rel="nofollow" class="external text" href="http://empslocal.ex.ac.uk/people/staff/mrwatkin/zeta/RHproofs.htm">Riemann hypothesis</a></li> <li> Resources: <a rel="nofollow" class="external text" href="http://iml.univ-mrs.fr/~ramare/TME-EMT/accueil.html">TME-EMT</a></li></ul> <p><br /> </p> <table style="margin: 0.25em auto; font-size: 1.5em;"><tr><td><a href="/wiki/Template:Sequence_of_the_Day" title="Template:Sequence of the Day">Sequence of the Day</a></td></tr></table><br /> <div style="float: right; clear: both; margin-top: 0.75em;">[<a href="/w/index.php?title=Template_talk:Sequence_of_the_Day_for_February_22&action=edit&redlink=1" class="new" title="Template talk:Sequence of the Day for February 22 (page does not exist)">talk</a>]</div> <h2><span class="mw-headline" id="Sequence_of_the_Day_for_February_22"><a href="/wiki/Template:Sequence_of_the_Day_for_February_22" title="Template:Sequence of the Day for February 22">Sequence of the Day for February 22</a></span></h2> <p><a href="http://oeis.org/A008604">A008604</a>: Multiples of <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">22</span>. </p> <dl><dd> </dd> <dd> <div style="margin: 0.5ex 0 0 0; font-size: 1.75em; text-align: baseline; background-color: transparent;"><div class="integer sequence" style="display: inline-block; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">{ 22, 44, 66, 88, 110, 132, 154, ... }</div></div></dd></dl> <p>An even number that is divisible by <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">22</span> is obviously divisible by <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">11</span>. (In base <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">10</span>, a number is divisible by <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">11</span> if and only if the sum of “digits” in base <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">100</span> is divisible by <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">11</span>, e.g. <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">1 + 10 = 11, 1 + 32 = 33, 1 + 54 = 55, ..., 2 + 14 + 94 = 110</span> implies that <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">110, 132, 154, ..., 21494</span> are divisible by <span class="math" style="white-space: nowrap; font-size: 1.15em; font-family: 'Computer Modern', STIXGeneral, 'Times New Roman';">11</span>.) </p><p><br /> </p> <h2><span class="mw-headline" id="Sequences_in_the_News">Sequences in the News</span></h2> <ul><li> <b>Aug 17 2021</b> Swiss scientists announce they have calculated π (<a href="http://oeis.org/A000796">A000796</a>) to 62.8 trillion digits in only 108 days.</li> <li> <b>Dec 25 2018</b> German Heise-News "integers, please" column explains <a href="http://oeis.org/A003173">A003173</a> and OEIS. </li> <li> <b>Feb 01 2018</b> Alphabet announced a $8,589,869,056 = $<a href="http://oeis.org/A000396">A000396</a>(6) stock buyback.</li> <li> <b>Jan 03 2018</b> Largest known term of <a href="http://oeis.org/A000043">A000043</a> announced: 77232917.</li> <li> <b>Nov 18 2016</b> PrimeGrid proves that 10223 is not a Sierpinski number, since 10223 × 2<span style="position: relative; vertical-align: 1.25ex; line-height: 0.75ex; font-size: 0.75em;"><span style="position: relative; vertical-align: middle;"> 31172165</span></span> + 1 is prime. So no changes to <a href="http://oeis.org/A076336">A076336</a> for now.</li> <li> <b>Sep 14 2016</b> Tom Greer discovers the twin primes 2996863034895 × 2<span style="position: relative; vertical-align: 1.25ex; line-height: 0.75ex; font-size: 0.75em;"><span style="position: relative; vertical-align: middle;"> 1290000</span></span> 卤 1 using PrimeGrid, TwinGen and LLR.</li> <li> <b>Jan 19 2016</b> Largest known term of <a href="http://oeis.org/A000043">A000043</a> announced: 74207281, also discovered by Curtis Cooper.</li></ul> <p><br /> </p> <h2><span class="mw-headline" id="Complaints">Complaints</span></h2> <p>I strive to live up to the highest ethical standards. If you feel that I have wrongly rejected one of your sequences (or otherwise failed to meet the expected standards), please leave a note at <a href="/wiki/Complaints_About_Editing" title="Complaints About Editing">Complaints About Editing</a> where it will be reviewed. I hope that in all cases you will first contact me (through the pink comment boxes, on my <a href="/wiki/User_talk:Charles_R_Greathouse_IV" title="User talk:Charles R Greathouse IV">user page</a>, or by email). </p> <!-- NewPP limit report Cached time: 20250222124135 Cache expiry: 3600 Dynamic content: true CPU time usage: 0.132 seconds Real time usage: 0.144 seconds Preprocessor visited node count: 1687/1000000 Preprocessor generated node count: 3245/1000000 Post鈥恊xpand include size: 15607/2097152 bytes Template argument size: 328/2097152 bytes Highest expansion depth: 20/40 Expensive parser function count: 1/100 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 113.772 1 -total 82.42% 93.776 1 Template:Sequence_of_the_Day 77.82% 88.540 1 Template:Sequence_of_the_Day/today 70.61% 80.338 1 Template:Sequence_of_the_Day_for_February_22 59.93% 68.188 19 Template:Sp 41.99% 47.777 10 Template:Mathfont 22.42% 25.510 1 Template:SoD's_t_or_c 17.43% 19.825 1 Template:Sequences_in_the_News 15.46% 17.588 2 Template:^ 3.38% 3.845 11 Template:Math/font --> </div> <!-- Saved in parser cache with key wikidb:pcache:idhash:183384-0!canonical and timestamp 20250222124134 and revision id 1662767 --> </div><div class="printfooter"> Retrieved from "<a dir="ltr" href="https://oeis.org/w/index.php?title=User:Charles_R_Greathouse_IV&oldid=1662767">https://oeis.org/w/index.php?title=User:Charles_R_Greathouse_IV&oldid=1662767</a>"</div> <div id="catlinks" class="catlinks catlinks-allhidden" data-mw="interface"></div> <!-- end content --> <div class="visualClear"></div> </div> </div> </div> <div id="column-one"> <h2>Navigation menu</h2> <div id="p-cactions" class="portlet" role="navigation"> <h3>Views</h3> <div class="pBody"> <ul> <li id="ca-nstab-user" class="selected"><a href="/wiki/User:Charles_R_Greathouse_IV" title="View the user page [c]" accesskey="c">User page</a></li> <li id="ca-talk"><a href="/wiki/User_talk:Charles_R_Greathouse_IV" rel="discussion" title="Discussion about the content page [t]" accesskey="t">Discussion</a></li> <li id="ca-viewsource"><a href="/w/index.php?title=User:Charles_R_Greathouse_IV&action=edit" title="This page is protected. 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