On-Line Encyclopedia of Integer Sequences
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. Sloane is the chairman of the OEIS Foundation.
| Founded | 1964 |
|---|---|
| Predecessor(s) | Handbook of Integer Sequences, Encyclopedia of Integer Sequences |
| Created by | Neil Sloane |
| Chairman | Neil Sloane |
| President | Russ Cox |
| URL | oeis |
| Commercial | No |
| Registration | Optional |
| Launched | 1996 |
Content license | Creative Commons CC BY-SA 4.0 |
OEIS records information on integer sequences of interest to both professional and amateur mathematicians, and is widely cited. As of November 2023, it contains over 367,000 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.