Saturday, October 28, 2006


The On-Line Encyclopedia of Integer Sequences (OEIS) is an extensive searchable database of integer sequences, freely available on the Web.

OEIS records information on integer sequences of interest to both professional mathematicians and amateurs, and is widely cited. It contains over 120,000 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. The database is searchable by keyword and by subsequence.