792397

This number is a prime.

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The smallest emirp concatenated from the same three double-digit primes 23, 79, 97 from which other four primes are concatenated, i.e., 237997, 239779, 799723, 977923. Note that the last one is also emirp. [Loungrides]

Submitted: 2020-02-17 17:12:27; Last Modified: 2020-02-17 18:25:26.