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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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