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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^{[1]} |

Registration | Optional^{[2]} |

Launched | 1996 |

Content license | Creative Commons CC BY-SA 4.0^{[3]} |

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 the chairman of the OEIS Foundation.

OEIS records information on integer sequences of interest to both professional and amateur mathematicians, and is widely cited. As of November 2023^{[ref]}, it contains over 367,000 sequences,^{[5]} making it the largest database of its kind.^{[citation needed]}

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.

**^**"Goals of The OEIS Foundation Inc".*The OEIS Foundation Inc*. Archived from the original on 2013-12-06. Retrieved 2017-11-06.**^**Registration is required for editing entries or submitting new entries to the database**^**"The OEIS End-User License Agreement - OeisWiki".*oeis.org*. Retrieved 2023-02-26.**^**"Transfer of IP in OEIS to the OEIS Foundation Inc". Archived from the original on 2013-12-06. Retrieved 2010-06-01.**^**"The On-Line Encyclopedia of Integer Sequences (OEIS)".