3

This number is a prime.

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(2^(p-1)-1)/p is congruent to 0 (mod 3), for all primes p greater than 3. This is a corollary to Fermat's Little Theorem. [Dunn]

Submitted: 2002-11-03 07:51:19; Last Modified: 2008-01-30 17:28:00.