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# Suggested Projects

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## Contents |

## Small or one-time sequence projects

- {{Sequence of the Day for March 1}} through {{Sequence of the Day for March 30}}. Choosing sequences and writing up a sentence or two about one interesting aspect of those sequences.
- Done for Mar 29 - Mar 31. Many among Mar 01 - Mar 28 still missing. — MFH 23:11, 9 March 2014 (UTC)

- I or s/o else should do the same edit done in https://oeis.org/history?seq=A210415 for A210414, A210416-A210423:
- Add < a href="/index/Se#self-referencing_sequences" >Index to the OEIS: Entries related to self-referencing sequences< /a >.
- Change the NAME in the same way.
- Add %Y Cf. A098645, A098670, A114134. (or not!? and/or add most relevant XREFS from the index?)

Thanks in advance! — M. F. Hasler 15:47, 10 October 2013 (UTC)

- Replace "http://neilsloane.com/doc/toothlist.html" by "/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS". Thanks in advance! - Omar E. Pol 14:26, 9 January 2014 (UTC)
- Replace "shell model of partitions" by "section model of partitions". Thanks in advance! - Omar E. Pol 12:50, 11 March 2014 (UTC)
- Replace "_Amarnath Murthy_ and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com)" with "_Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com)". Thanks! - Jon E. Schoenfield 18:22, 27 April 2014 (UTC)

## Large or ongoing sequence projects

- Look through journals and books, especially those available on the web, for (a) new sequences (add them!), (b) references to existing sequences (add a reference or link to that entry), and (c) mentions of the OEIS (add them to the list of "Works Citing the OEIS" on the wiki). The following is a partial list of journals and books to look at.
- ARS MATHEMATICA CONTEMPORANEA
- Electronic J. Combinatorics
- Directory of open access journals (clicking on "Browse" on the left then on "Mathematics and Statistics" leads to the mathematical branch)
- Electronic Research Announcements of Amer. Math. Soc.
- European J. Combinatorics
- Experimental Mathematics
- Fibonacci Quarterly
- Integers: Electronic Journal of Combinatorial Number Theory
- J. Chem. Inform. Comput. Sci. (Enumerative chemistry, now renamed as J. Chem. Info. and Modeling)
- J. Integer Sequences
- Nieuw Archief voor Wiskunde
- Royal Society journals
- Wikipedia list of math journals
- Small collection of links

- Max Alekseyev, automated discovery of unknown formulae, posting to SeqFan on Oct 25 2011. The project is ongoing at the George Washington University. — Max Alekseyev 12:57, 25 December 2011 (UTC)
- Indexing/cross-referencing large [and especially poorly documented/cross-linked] "series", e.g. Decimal expansion of 1/3, 2/3, 1/6, 5/6, 7/6,1/7,......,1/998, (and ultimately all "cons" sequences). — M. F. Hasler 21:48, 24 October 2011 (UTC)
- BTW, this project would merit a page on its own to synchronize / show progress / manage "TO DO's", etc. — M. F. Hasler 21:48, 24 October 2011 (UTC)

- Improve the index (since we do not yet have categories), especially
- for sequences of some 1000+ categories like decimal expansion of ...
- by wikifying cross references inside the index (e.g. on the above page, "see square roots" or "decagon is spelled 10-gon..." etc.) — M. F. Hasler 03:55, 26 October 2011 (UTC)
- Perhaps add an index to the hypergeometric recurrences in the spirit of the linear recurrences. Essentially covering all the sequences with a square root in the o.g.f. including many walks, Catalan and Motzkin sequences. — R. J. Mathar 11:46, 14 November 2011 (UTC)
- Richard, I think this would be a great project, certainly of importance. I'm not sure what the best way to categorize them is (an analogue, hopefully, of your "signature" for linear recurrences) but I've also seen the need. Charles R Greathouse IV 04:26, 31 January 2012 (UTC)
- Started a section in the "Rea" section of the index under "recurrences, hypergeometric" which uses a major order following the number of terms involved, a minor order following the order of the polynomial of the coeffs., and the integer coeffs. of the polys. from high to low degree. The defining convention is actually that the terms are written poly0*a(n)+poly1*a(n-1)+...=0, because the n-depend. of the poly(i) depend on the agreement on the indexing (increasing, decreasing, offset) of the a(i). Is this the most common formulation of the recurrence? R. J. Mathar 12:41, 29 February 2012 (UTC)

- Check terms, add proper names, edit the 2130 unedited sequences.
- Go through Guy's UPNT and add references (to papers referenced by Guy as well as to UPNT itself, with the section), formulas, and any other relevant material; also add new sequences as needed. I think the best approach would be a distributed project where many people each volunteer to take one or more sections. Charles R Greathouse IV 04:43, 15 March 2012 (UTC)
- More important and more urgent: find out the present state of Richard Guy's updates in preparation of the new edition of UPINT! - N. J. A. Sloane, Mar 20, 2013
- Create a "community portal" with a corner (or simply a separate page) "TO DO on OEIS", where one could post "request of jobs to be done" (instead of posting to SeqFan list), like: Errors to correct -- Please double-check, I suspect an error in Seq. Annn -- Someone who feels competent, please calculate more terms for Annn concerned with ... [I know, KW "more" essentially means the same...] -- etc. — M. F. Hasler 13:44, 24 August 2012 (UTC)
- Create an iOS interface or app; I'm willing to make an OEIS interface for iPhone/iPod touch/iPad. If appropriate, any suggestions on how to access the database from outside? — Jens Bossaert 18:47, 7 April 2013 (UTC)
- I'm curious as to what you'd want the application to do (beyond what the site does, of course). The project sounds interesting and I might be able to help (though I don't have an Apple developer account).
- As for accessing the database, I just use https://oeis.org/search?q=id%3AA000001&fmt=text. Or do you mean something else?
- Charles R Greathouse IV 18:58, 7 April 2013 (UTC)

- Insert b-files at the top of the "links" field. If possible automatically move b-file links that are not at the top to the top. - Joerg Arndt 12:27, 25 April 2013 (UTC)
- Preserve line breaks in pink-box comments. - Joerg Arndt 12:27, 25 April 2013 (UTC)
- Add the keyword "more" where obviously needed. I did that for up to A001500. The file stripped.gz is of great help with this task. — Joerg Arndt 13:56, 21 May 2013 (UTC)
- Go through sequences marked keyword:more keyword:easy and either expand or reclassify. - Charles R Greathouse IV 05:44, 19 June 2013 (UTC)
- Add links to those references with arXiv identifiers to make them easier to follow. The search responds with 56 pages (approx. 560 sequences) as of 22 July 2014.
- Conservation of web pages linked to from OEIS, from Neil Sloane, Oct 08, 2013
- It would be nice to have a third Plot in the button “Graph”. The appearance of the third Plot should be the same as "Plot 2" or “Plot pairs of sequences in the OEIS” with the following configuration: Sequence 1: A?????? untransformed (our sequence). Sequence 2: A000004 (always) untransformed. Contents of Plot: “Plot Seq2(n+shift) vs n and Seq1(n) vs n”. Appearance of Plot: “Draw line segments” (only). For instance, see this proposed Plot for A005132 Recaman’s sequence. See also this proposed Plot for A064413 EKG sequence. I think that a large number of sequences may show a nice graph using this proposed Plot. Omar E. Pol 15:20, 30 November 2013 (UTC)
- Add a link from https://oeis.org to http://list.seqfan.eu/pipermail/seqfan . Add a link from https://oeis.org/draft to http://list.seqfan.eu/pipermail/seqfan . Add a link from https://oeis.org/draft/editing to http://list.seqfan.eu/pipermail/seqfan . - Omar E. Pol 12:15, 1 May 2014 (UTC) Why? Bookmarks exist. - Joerg Arndt 12:25, 30 June 2014 (UTC)

## Other

- Should journal and book titles in the CiteA, CiteB, ... CiteZ pages be italicized? — Alonso del Arte 15:56, 29 November 2011 (UTC)

Answer: I am continually adding items to the Cites pages. Each change calls for 4 clicks (preview,save,submit,approve), and each click takes several seconds. It is very slow work. Furthermore, I use the same line that I have typed when I add the work to the appropriate sequences in the OEIS entries. So I try to keep things as simple as possible. The line that I type has to work both on the wiki side, where the language is MediaWiki, and on the OEIS side, where the language is basically html, or plain text. So the answer to your question is, if you want to do it, go ahead. But I don't have time! N. J. A. Sloane, Oct 8, 2013.

## Done

- (Done) Replace "O. E. Pol" by "Omar E. Pol". Thanks in advance! - Omar E. Pol 14:30, 9 January 2014 (UTC)
- Seems done everywhere(?) except in REFS/LINKS where using only initials is the standard. — MFH 23:15, 9 March 2014 (UTC)

- (Done) Replace "__Leroy Quet__" with "_Leroy Quet_". Thanks! - Jon E. Schoenfield 02:02, 11 February 2014 (UTC)
- (Done) Replace geocities.com URL's or mark them with [broken link?] - R. J. Mathar 09:51, 11 July 2013 (UTC)
- (Done) Replace "outer shell" by "last section", except in the entry A173592. There are 44 sequences that contain this phrase. Thanks in advance! Omar E. Pol 13:10, 1 December 2013 (UTC)
- Completed the change with "outer shell" and "outer shells" then reverted A173592. The global replacement system isn't particularly flexible... Charles R Greathouse IV 18:39, 1 December 2013 (UTC)

- (Done) Request the deTeXification of "Approximations de S\'{e}ries G\'{e}n\'{e}ratrices et Quelques Conjectures". Search finds it 612 times. Peter Luschny 21:22, 17 November 2013 (UTC)
- (Done) Request the deTeXification of "Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al". Search finds it 628 times. Peter Luschny 23:19, 16 November 2013 (UTC)
- (Done) Replace "outer shell of the partitions" by "last section of the set of partitions". There are 74 sequences that contain this phrase. Thanks in advance! Omar E. Pol 11:46, 30 November 2013 (UTC)
- (Done) Request the following global replacements (each of which, the last time I checked, would cover 10 or more places in the OEIS). Thanks! Jon E. Schoenfield 05:09, 10 October 2013 (UTC)
- "Roberto E. Martinez II (remartin(AT)fas.harvard.edu)" -> "_Roberto E. Martinez II_"
- "Owen Whitby (whitbyo(AT)acm.org)" -> "_Owen Whitby_"
- "Tomaz Pisanski (Tomaz.Pisanski(AT)fmf.uni-lj.si)" -> "_Tomaz Pisanski_"
- "T. D. Noe (noe@sspectra.com)" -> "_T. D. Noe_"
- "Pierre CAMI (colettecami(AT)aol.com)" -> "_Pierre CAMI_"
- "Frans Faase (Frans_LiXia(AT)wxs.nl)" -> "_Frans J. Faase_"
- "Rob Pratt (Rob.Pratt(AT)sas.com)" -> "_Rob Pratt_"
- "Robert W. Pratt (Rob.Pratt(AT)sas.com)" -> "_Rob Pratt_"
- "Howard A. Landman (howard(AT)polyamory.org)" -> "_Howard A. Landman_"
- "Stephen Crowley (crow(AT)crowlogic.net)" -> "_Stephen Crowley_"
- "Richard Sabey (richardsabey(AT)hotmail.co.uk)" -> "_Richard Sabey_"
- "Olaf Voss (richyfourtythree(AT)yahoo.com)" -> "_Olaf Voß_"
- "Greg Huber huber(AT)alum.mit.edu" -> "_Greg Huber_"
- "Jim Propp (propp(AT)math.wisc.edu)" -> "_James Propp_"
- "Leonid Broukhis (leo(AT)mailcom.com)" -> "_Leonid Broukhis_"
- "Neville Holmes (neville.holmes(AT)utas.edu.au)" -> "_W. Neville Holmes_"
- "Jonathan D. B. Hodgson (hodgsonjdb(AT)btinternet.com)" -> "_Jonathan D. B. Hodgson_"
- "Leonid Broukhis (leob(AT)mailcom.com)" -> "_Leonid Broukhis_"
- "Ignacio Larrosa Canestro (ignacio.larrosa(AT)eresmas.net)" -> "_Ignacio Larrosa Cañestro_"
- "Ross Drewe (rd(AT)labyrinth.net.au)" -> "_Ross Drewe_"
- "Dann Toliver (fsdrt(AT)hotmail.com)" -> "_Dann Toliver_"
- "_Mohammad K. Azarian_, azarian(AT)evansville.edu" -> "_Mohammad K. Azarian_"
- "Joel Lewis (jblewis(AT)fas.harvard.edu)" -> "_Joel B. Lewis_"
- "James East (jameseastseq(AT)hotmail.com)" -> "_James East_"
- "Vassilis Papadimitriou (bpapa(AT)sch.gr)" -> "_Vassilis Papadimitriou_"
- "Paul Lusch (plusch(AT)flash.net)" -> "_Paul Lusch_"

- Done. Charles R Greathouse IV 19:33, 12 October 2013 (UTC)

- (Done) Request the following global edits. Thanks! Jon E. Schoenfield 18:37, 4 October 2013 (UTC)
- change "Andre F. Labossiere (boronali(AT)laposte.net)" to "_André F. Labossière_"
- change "Bodo Zinser (BodoZinser(AT)Compuserve.com)" to "_Bodo Zinser_"
- change "Bodo Zinser (BodoZinser(AT)CosmoData.net)" to "_Bodo Zinser_"
- change "Henri Lifchitz 100637.64(AT)CompuServe.COM" to "_Henri Lifchitz_"
- change "Kailasam Viswanathan Iyer (kvi(AT)nitt.edu)" to "_K.V.Iyer_"
- change "Sam Alexander (amnalexander(AT)yahoo.com)" to "_Sam Alexander_"
- change "Soren Eilers (eilers(AT)math.ku.dk)" to "_Søren Eilers_"

- (Done) Go through the ~100 sequences in palindromic primes -keyword:base and give keyword:base to all appropriate sequences.
- About half needed the keyword. Charles R Greathouse IV 14:19, 3 October 2013 (UTC)

- (Done) Go through the 500+ sequences returned by searching for the email address "rpropper(AT)stanford.edu" and replace "Ryan Propper (rpropper(AT)stanford.edu)" with _Ryan Propper_; make similar changes to remove email addresses of registered users Shyam Sunder Gupta (guptass(AT)rediffmail.com), Washington Bomfim (webonfim(AT)bol.com), Augustine O. Munagi (amunagi(AT)yahoo.com), Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Omar E. Pol (info(AT)polprimos.com), Mike Oakes (Mikeoakes2(AT)aol.com), Robert Gerbicz (gerbicz(AT)freemail.hu), Gene Ward Smith (genewardsmith(AT)gmail.com), Fred Schneider (frederick.william.schneider(AT)gmail.com), Ed Pegg Jr (ed(AT)mathpuzzle.com), and Clark Kimberling (ck6(AT)evansville.edu).
- (Done) Request the following global edits:
- change "Michael Joseph Halm (hierogamous(AT)lycos.com)" to "_Michael Joseph Halm_"
- change "Howard A. Landman (howard(AT)riverrock.org)" to "_Howard A. Landman_"
- change "R. H. Hardin rhh(at)cadence.com" to "_R. H. Hardin_"
- change "Brendan McKay (bdm(at)cs.anu.edu.au)" to "_Brendan McKay_"
- change "A. O. Munagi (amunagi(AT)yahoo.com)" to "_Augustine O. Munagi_"
- change "Shyam Sunder Gupta (guptass(AT)rediffmail.com)" to "_Shyam Sunder Gupta_"
- change "Ryan Propper (rpropper(AT)stanford.edu)" to "_Ryan Propper_"
- change "Jasinski Artur (grafix(AT)csl.pl)" to "_Artur Jasinski_"
- change "Artur Jasinski with assistance from Bob Hanlon (grafix(AT)csl.pl)" to "_Artur Jasinski_ with assistance from Bob Hanlon"
- change "Santi Spadaro (spados(AT)katamail.com)" to "_Santi Spadaro_"
- change "J. Lowell, jhbubby(AT)mindspring.com" to "_J. Lowell_"

- thanks! Jon E. Schoenfield 02:54, 3 October 2013 (UTC)

- (DONE) Change each of the ~83 sequences that contain the string "Diana Mecum (diana.mecum(AT)gmail.com)" and replace it with "_Diana L. Mecum_" (I'm assuming they're the same individual!). -- Jon E. Schoenfield, Sep 23 2013.
- (Done) Assuming that the email address and registered username in each of the following pairs is for the same individual, replace the existing name string (spellings may vary!) and existing email address with the registered username. -- Jon E. Schoenfield, Sep 23 2013.
- "cjsalves(AT)gmail.com" / "_Carlos Alves_"
- "rpropper(AT)cs.stanford.edu" / "_Ryan Propper_"
- "drew(AT)math.mit.edu" / "_Andrew V. Sutherland_"
- "xordan.tom(AT)gmail.com" / "_Tomas Xordan_"
- "rohelakhan(AT)yahoo.com" / "_Sameen Ahmed Khan_"
- "alonso.delarte(AT)gmail.com" / "_Alonso del Arte_"
- "olivier.gerard(AT)gmail.com" / "_Olivier Gérard_"

- (Done) Please replace everywhere:
- (Done) Repair links to SeqFan threads as announced in Re: Early SeqFan archives — R. J. Mathar 18:04, 4 January 2013 (UTC)
- (Done) Replace "Vladeta Jovovic (vladeta(AT)eunet.yu)" by "_Vladeta Jovovic_" — Joerg Arndt 13:58, 21 May 2013 (UTC)
- (Done) Replace "Frank Ruskey, Nate Kube (ruskey(AT)cs.uvic.ca)" by "_Frank Ruskey_ and Nate Kube" . R. J. Mathar 14:13, 9 May 2013 (UTC)
- (Done) Replace the names "A simple regular expression in a labeled universe" by more specific ones. — R. J. Mathar 21:24, 17 November 2011 (UTC)
- (Done) The paper V. Jelinek, T. Mansour and M. Shattuck, On multiple pattern avoiding set partitions, Advances in Applied Mathematics Volume 50, Issue 2, February 2013, Pages 292-326 (I have a copy), contains a number of generating functions (See Theorems 4.1, 4.2, Ex. 4.16 (3), 4.17 (2), Prop. 4.20, 4.21, 4.23, 4.27, and maybe others). Could someone produce the sequences corresponding to these g.f.'s and add them to the OEIS if they are new, or add references to this paper if they are already in the OEIS? - N. J. A. Sloane, 1 January 2013. doi:10.1016/j.aam.2012.09.002, Theorem 4.1=A025242. Theorem 4.2=A005773. Ex. 4.16=A005183 and A116701, but H1121 gives negative terms (incorrect), L1121 =A209230 (new, sign corrected). L_{1232}=A005183, same as proposition 4.20. Lemma 4.21=essentially A132750. R. J. Mathar 21:42, 12 January 2013 (UTC)
- (Done) Replace http://algo.inria.fr/csolve by http://www.people.fas.harvard.edu/~sfinch/csolve . R. J. Mathar 18:15, 8 January 2013 (UTC)
- (Done) Apparently the book M. Pitici, editor, The Best Writing on Mathematics, Princeton Univ. Press, 2012 mentions the OEIS - can someone tell me in which chapter, page numbers, etc.? - N. J. A. Sloane, Jan 02 2013
- (Done) Repair references to arxiv esp. by E. Deutsch: already fixed ~ 25 occurrences of "arxiv1111...." to "arxiv:1111..." by hand, but there are about 30 left (cf. https://oeis.org/search?q=arXiv1111&fmt=short), and most probably others (not only(?) from the same submitter). — M. F. Hasler 18:37, 6 January 2013 (UTC)
- I corrected all 26 cases, plus two similar ones I found. Charles R Greathouse IV 18:10, 7 January 2013 (UTC)

- (Done) Apparently this paper: Keisuke Nakano, Shall We Juggle, Coinductively?, in Certified Programs and Proofs, Lecture Notes in Computer Science Volume 7679, 2012, pp 160-172, DOI 10.1007/978-3-642-35308-6_14 mentions the OEIS and probably has one or more new sequences in it - does anyone have access to a copy? - N. J. A. Sloane, Jan 02 2013

See Suggested Projects/Archive for projects completed earlier.

## Not done

- Reducing all (or most) b-files to the standard size (10000?). [From Moshe Levin]
- I strongly disagree. The b-files should never be shortened. — N. J. A. Sloane, Oct 25 2011
- Maybe extending when possible b-files to a thousand or ten thousand terms (as recently happened with A065449 with a b-file that went up to 466, so Charles extended it to 1000. [From Alonso del Arte 20:02, 24 October 2011 (UTC)]
- This has been discussed earlier, see also http://oeis.org/wiki/User_talk:M._F._Hasler/dynamic_content#The_basic_idea: If there is an excessively large b-file, it would indeed be useful to have b-file(s) of handier size, which could be created by the server (either physically as a file or virtually/dynamically "upon request"), by simply truncating the existing one. — M. F. Hasler 19:59, 24 October 2011 (UTC)

- Maybe extending when possible b-files to a thousand or ten thousand terms (as recently happened with A065449 with a b-file that went up to 466, so Charles extended it to 1000. [From Alonso del Arte 20:02, 24 October 2011 (UTC)]

- I strongly disagree. The b-files should never be shortened. — N. J. A. Sloane, Oct 25 2011