11251...15211 (1345-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

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The bottom row of a palindromic prime pyramid of odd primes (starting with 3) of step size 4 and height 169, where each palindromic prime p is the smallest p containing p in the above row. [Gupta]

Submitted: 2026-09-09 12:59:23; Last Modified: 2026-09-09 13:10:04.