769

This number is a prime.

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The smaller of only two 3-digit primes p, (emirp), such that p^2 is a concatenation of three double-digit primes, i.e., 591361 = 769^2. The other such prime is 823. [Loungrides]

Submitted: 2017-01-01 19:33:01; Last Modified: 2018-05-08 10:42:07.