4723

This number is a prime.

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The larger of only two 4-digit primes, each concatenated from a safe prime, 2p+1, and the corresponding Sophie Germain prime p, case p=23. The other is 2311. [Loungrides]

Submitted: 2012-10-12 17:48:12; Last Modified: 2018-05-02 20:28:06.