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The October issue of the Notices of the Amer. Math. Soc. has an article about the OEIS.
The Email Servers and Superseeker
There are two automatic email servers for identifying sequences:
- The first, email@example.com,
does a simple look-up in the OEIS.
Send the message
lookup 1 2 5 14 42 132 429         [no commas!]
for example (with no Subject line).
Up to 30 sequences can be submitted at the same time.
The email reply will tell you any sequences
in the OEIS (up to a limit of 50) that match your sequence.
If the word "lookup" does not appear in your message,
you will be sent the
for this server.
You can also retrieve sequences by A-number -- say
(However, you can't have both sequence lookups and A-number lookups
in the same email message.)
- The second server, Superseeker, does
not just look up the sequence in the OEIS, it will also
apply a large number of algorithms in order to attempt to explain the
sequence. Send a message to
containing a line like
lookup 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
(with no Subject line).
The program will try VERY hard to find an explanation.
Only one request may be submitted at a time, and (since this
program does some serious computing), only one request per user
per hour please. If there is no lookup line you will receive the
Source Code For Email Servers and Superseeker
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Last modified September 26 08:56 EDT 2018. Contains 315430 sequences. (Running on oeis4.)