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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] The next prime year that is the sum of three consecutive primes.
(There is one curio for this number that has not yet been approved by an editor.)
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