491

This number is a prime.

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491 is a Sophie Germain prime. 491 is also a divisor of a Generalized Fermat Number, as 491 * (2^123281+1) divides GF(123280,10) = 10^(2^123280) + 1. [Carmichael]

Submitted: 2004-10-25 05:48:30;   Last Modified: 2008-01-30 11:28:00.
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