757

This number is a prime.

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757 is the smallest multidigit palindromic prime p = Pₙ for which the symmetric concatenation n||p||rev(n) yields a palindromic prime: 134||757||431 = 134757431. [Ahmed]

Submitted: 2026-06-27 12:05:35; Last Modified: 2026-06-29 01:36:14.