419

This number is a prime.

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419 is a Sophie Germain prime, since 2 * 419 + 1 = 839, which is prime. Note that it is the 22nd Sophie Germain prime, and 22 = 2 * 11 is the product of two Sophie Germain primes. [Carmichael]

Submitted: 2004-10-25 10:53:46; Last Modified: 2008-01-30 17:28:00.

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