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Deleted sequences

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  • Sequences are occasionally removed from the OEIS and their A-numbers recycled.
  • Remember that if you delete a sequence, you must also delete (or update) all references to it in other entries—first do a search for the A-number in, then here in the OEIS wiki (in case there are references to it in the wiki pages).
  • If the deleted sequence had a b-file, that must be deleted also, or it will cause problems when the A-number is recycled. To delete a b-file, contact David Applegate, Russ Cox, Charles R Greathouse IV, or N. J. A. Sloane.
  • Sequences that have been in the OEIS for a long time (even if they already have keyword "dead") should not be deleted. If they are incorrect or duplicates they can be given the keyword "dead".

Reasons for deletion

There are several reasons why a sequence may be deleted from the OEIS. Typically, this happens if the sequence is:

  • a duplicate of a sequence already in the OEIS,
  • an erroneous version of a sequence already in the OEIS,
  • ill-defined (e.g. eventually some term has multiple or ambiguous values, or the sequence is time-dependent),
  • withdrawn by the author,
  • does not contain enough terms (usually we need at least four terms),
  • too artificial or contrived,
  • not of general interest (NOGI),
  • contains unacceptable language,
  • a new submission which has been on the Sequences awaiting review (Proposed drafts or Pending changes) list for over three months. (This usually happens when the author does not respond to the editors' questions.)

Some advice

To ensure that your sequence is not deleted:

  • Be very careful when calculating the sequence;
  • Give a precise definition;
  • Check that the sequence (even without the initial terms) is not already in the OEIS;
  • Write in correct English;
  • Include a comment saying why the sequence is interesting;
  • Give an example;
  • Say how you computed the sequence;
  • Give a computer program.

List of deleted sequences

This is a list of sequences which have been deleted, starting from the most recent.

  • "rifo" means "retired in favor of" (in other words, "the latter sequence is preferable").
  • "NOGI" means "Rejected because not of general interest".

One can use either a simple dash or hyphen (-) or an — (—) before a signature.

October 2019

September 2019

August 2019

July 2019

June 2019

May 2019

Apr 2019

Mar 2019

Feb 2019

Jan 2019

Older entries

See also