617

This number is a prime.

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+ The smallest prime that has an expression in more than one way as the repdigit sum of the four prime digits (2, 3, 5, 7), in each case with the summands concatenating to a prime in this digit order: 617 = 22 + 33 + 555 + 7 = 222 + 333 + 55 + 7 with 22335557 and 222333557 being primes. [Beedassy]

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