The On-Line Encyclopedia of Integer Sequences (OEIS) is an online database of integer sequences. It was created and maintained by Neil Sloane while researching at AT&T Labs. He transferred the intellectual property and hosting of the OEIS to the OEIS Foundation in 2009.[4] Sloane is chairman of the OEIS Foundation.

Quick facts: Founded, Predecessor(s), Created by, Cha...
On-Line Encyclopedia of Integer Sequences
Founded1964; 58 years ago (1964)
Predecessor(s)Handbook of Integer Sequences, Encyclopedia of Integer Sequences
Created byNeil Sloane
ChairmanNeil Sloane
PresidentRuss Cox
URLoeis.org
CommercialNo[1]
RegistrationOptional[2]
Launched1996; 26 years ago (1996)
Content license
Creative Commons CC BY-NC 3.0[3]
Close

OEIS records information on integer sequences of interest to both professional and amateur mathematicians, and is widely cited. As of January 2022, it contains over 350,000 sequences, making it the largest database of its kind.

Each entry contains the leading terms of the sequence, keywords, mathematical motivations, literature links, and more, including the option to generate a graph or play a musical representation of the sequence. The database is searchable by keyword, by subsequence, or by any of 16 fields.

Oops something went wrong: