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The On-Line Encyclopedia of Integer Sequences

The On-Line Encyclopedia of Integer Sequences

A large searchable database of integer sequences. The main purpose of this site is to allow researchers to discover if new sequences that they encounter have been previously studied. But, also, the site serves as an information repository for important, well-known sequences. For example, the page in this on-line encyclopedia for the Fibonacci sequence contains many comments, references, formulas and dozens of links to other on-line resources pertaining to Fibonacci and his famous sequence. Warning: If you input 1,1,2,3,5,8,13,21 into the search engine, it will retrieve more than thirty different sequences from the database. If you are looking specifically for the Fibonacci sequence, you could input more terms of the sequence, or you could do a word search. Each sequence is given an ID number on the site. The main entry for the Fibonacci sequence is # A000045.


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