Instructions For General Users

Instructions For General Users of the OEIS

• The main OEIS page is http://oeis.org. Use that page for looking up a sequence, searching the database, contributing new sequences, editing sequences, etc. There is no charge for using any part of the OEIS.
• For more information about the OEIS, see the Welcome Page
• The OEIS Wiki contains discussion pages related to the OEIS—everything EXCEPT the sequences themselves.
• To edit an existing sequence or to contribute a new sequence, you must first register with the OEIS Wiki. Then use the same user name and password for the main OEIS page.
• The OEIS is owned, maintained and supported by The OEIS Foundation Inc. - please help it survive by donating.
• The old OEIS web sites (www.research.att.com/~njas/sequences/ and oeis.org/classic) are now obsolete and have been replaced by http://oeis.org.

Hints on using the OEIS

See the hints page. Some recent queries:

• Can one give a single number and find which sequences contain it? Yes: Enter 4455 for example in the search window.
• Can one search for not necessarily consecutive terms? Yes: If you are searching for just 2 numbers, enter them separated by spaces. Otherwise, it does not matter what symbol you use to separate them -- spaces work just as well as commas;. For example, enter 7 ! 45 ! 115 ! 217
  • For a subsequence, in which the terms must appear in order, type subseq:7,45,115,217.

How many terms do we need?

• Normally an entry in the OEIS will give enough terms to fill three lines on the screen, about 260 characters including spaces. (Enough to fill about three punched cards, in the old days.)
• If more terms are available, then the entry may have a b-file, giving the first 10000 or more terms. See the Style Sheet for more about b-files.
• If the entry already has about three lines' worth of terms, there is usually no point in adding more terms to the DATA lines—instead, create a b-file.