257

This number is a prime.

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The smallest prime-digit prime with distinct digits that is the sum of three prime-digit primes, i.e., (7+23+227). Note that the concatenation in order of these primes, i.e., 723227 is also prime. [Loungrides]

Submitted: 2012-05-04 12:16:11; Last Modified: 2021-06-14 17:50:06.