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: 2020-07-15 22:07:33; Last Modified: 2020-07-16 06:37:54.
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