# 25169

This number is a prime.

The smallest prime formed by concatenating the squares (9,
16, 25) of a primitive Pythagorean triple in the reverse
order. Note the prime sum of digits and the fact that this
Pythagorean triple (*X, Y, Z*) is the only one that
forms with its reversal a palindromic prime *XYZYX*
(34543) with also a prime sum of digits. [Beedassy]

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