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(Greetings from The On-Line Encyclopedia of Integer Sequences!)

Demonstration of the

On-Line Encyclopedia of Integer Sequences® (OEIS®)

(Page 9)

Browsing the On-Line Encyclopedia and the WebCam

An excellent way to see the wide variety of sequences in the database is to use the WebCam.

You can set this to browse "All Sequences", "Best Sequences", "Sequences Needing More Terms" or "New Sequences".
You can adjust it so it loads a new sequence every 5, 10, 20, 30 or 60 seconds, or when you say so.

Setting it to "All Sequences" displays a sequence chosen at random from the entire database.

"Best Sequences" are usually more interesting - these are sequences which have a high importance ranking (keywords "nice" or "core", for example).

"New Sequences" shows a sequence with keyword "new", meaning that it has arrived - or been significantly changed - in the past two weeks.

Setting the WebCam to "Sequences Needing More Terms" will show sequences which need extending, giving you an opportunity to contribute to the On-Line Encyclopedia and to get your name into the database.

Warning: browsing the database can be quite addictive!


Thousands of people use the sequence database every day. Please take great care when extending a sequence and make certain that the terms you send are absolutely correct. The standards are those of a mathematics reference work.

Sending in an extension.

  • Please use the form when sending extensions or comments.

  • Ideally we would like to get enough terms for each sequence to fill about three lines on the screen. Failing that even a single extra term is always welcome.

Many thanks to Russ Cox, who rewrote the WebCam program in JavaScript in December 2005. This greatly improved the performance (the new version requires that your browser supports JavaScript and that Javascript is enabled).

Click the single right arrow to go to the next demonstration page, or the single left arrow to return to the previous page.

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Last modified February 28 11:45 EST 2021. Contains 341703 sequences. (Running on oeis4.)