419
This number is a prime.
Just showing those entries submitted by 'Carmichael': (Click here to show all)
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]
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