137131

This number is a prime.

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The smallest emirp formed by concatenating primes in two ways, i.e., (i) two consecutive 3-digit primes, (137, 131) and (ii) three double-digit emirps, (13, 71, 31). [Loungrides]

Submitted: 2015-08-31 05:05:04; Last Modified: 2023-10-05 14:02:54.