547

This number is a prime.

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The largest prime concatenated from the only three single digits d for which d!+1 are perfect squares, i.e., 5!+1 = 11^2, 4!+1 = 5^2 and 7!+1 = 71^2. [Loungrides]

Submitted: 2019-02-09 16:59:58; Last Modified: 2020-07-26 15:27:49.