2129
This number is a prime.
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The smallest Sophie Germain prime that is also a strong prime with digits that alternate in parity.
2129 is the smallest Sophie Germain prime that is also a twin prime with digits that alternate in parity.
2129, when concatenated with the next 2 primes, is prime: 212921312137 is prime. [Noll]
Submitted: 2009-08-09 18:27:32; Last Modified: 2016-03-01 11:38:10.
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