54762209

This number is a prime.

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The largest prime concatenated from the squares of a double-digit prime p and its reversal R(p), i.e., 47^2 = 2209, 74^2 = 5476. [Loungrides]

Submitted: 2020-07-16 03:07:33; Last Modified: 2020-07-16 11:37:54.