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oeis

http://www.research.att.com/~njas/sequences/?q=%s[use %2C for spaces]&language=english&go=Search
On-Line Encyclopedia of Integer Sequences

Type in a sequence of integers, 
get back known sequences that match yours.

Examples:
  oeis 1 2 3 5 8
  oeis 1 1 1 3 3 4 9
550 uses - Created 2006-01-20 05:04 - Last used 2010-01-02 00:14
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