22

This number is a composite.

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The longest known arithmetic sequence of primes is currently 22, starting with the prime 11410337850553 and continuing with common difference 4609098694200 (found by Pritchard, Moran, and Thyssen in 1993).

Submitted: 2002-12-31 01:47:53; Last Modified: 2008-01-30 17:28:00.