Most people use the OEIS to get information about a particular number sequence. If you are a new visitor, then you might ask the database if it can recognize your favorite sequence, if you have one. To do this, go to the main look-up page, enter the sequence, and click Search. You could also look for your sequence in the Index.

You might also look at the demonstration pages to see more examples of how to use the OEIS.

If your favorite sequence isn't in the database, and if it is interesting, please submit it using the web page for Contributing a new sequence or comment. Of course the sequence should be well-defined, of general interest and ideally it should be infinite. Short sequences such as phone numbers are not appropriate. Before submitting a new sequence, you must first register.

If you have stumped the database, you can try Superseeker, which tries really hard to identify a sequence. Send an empty email message to superseeker@oeis.org to get instructions.

You can browse the database, using the WebCam. This can be set to look at the most interesting sequences, recent additions, or sequences needing more terms. It can be quite addictive!

It is also interesting to browse the Index to the OEIS to see the variety of topics that are covered. In a way the OEIS can be regarded as an index to all of science. It is like a dictionary or fingerprint file for number sequences.

Also worth visiting are the pages dealing with Puzzle sequences, Classic sequences and Hot sequences.

You might also like to see the list of papers that have acknowledged help from the database and some comments from readers.

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⣼⠓⢄⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠏⢹⠀⠀⠱⡀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⠀⢸⠀⠀⠀⠘⠄
⣤⣤⡤⢤⣀⣀⠀⠀⠀⠀⢀⠃⠀⠈⠒⠢⢤⡀⡁⠀⠀⠀⠀⢀🍒⣤⠤⢄⣀
⡏⠉⠒⠒⠤⡀⠉⠙⠊⠁⠀⠀⠀⠀⠀⠀⠀⠈⢺⠀⠀⠀⣠⠞⢛⠛⠋⡈⡀⠌⢣
⠸⡀⠀⠀⢀⠎⠀⠀⠀⠀⠀⠀⠀⢀⡖⠛⠲⠀⠀⠱⠀⠀⡎⠄⡁⠄⡁⠄⡀⠄⡁⠸⡀
⠀⠱⡀⠀⡎⠀⠀⠀⠀⠀⠀⠀⠀⠈⠃⠀⠀⠀⠀⠀⠨⠀⢘⠡⡀⠄⡀⠄⡀⠄⡀⠨⡎
⠀⠀⠈⠺⡇⠀⢀⡞⠉⠉⠂⠀⠀⠀⢀⠀⠀⠀⢀⣹⡉⡩⢢⡀⠄⡀⠄⡀⠄⣠⠏⡅
⠀⠀⠀⠀⢇⠀⠈⠃⠀⠀⠀⣀⠜⠓⢻⠀⠀⠀⡰⠗⠉⠀⢀⡍⢦⣄⣤⣴⠟⠋⠀⡸
⠀⠀⠀⠀⢣⠀⠀⠀⠀⠀⠀⠀⠑⠤⠜⠀⠀⠊⠀⠀⢀⠞⠉⠀⠀⠈⢣⣀⣠⠤⠚⠁
⠀⠀⠀⠀⠀⡳⠧⡥⢦⣆⡀⠀⠀⠀⠀⠀⠀⠀⠠⠊𝙃𝙖𝙫𝙚 𝙖 𝙏𝙚𝙧𝙧𝙞𝙛𝙞𝙘 𝙒𝙚𝙚𝙠𝙚𝙣𝙙