19510...01591 (739-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 (starting at 5) of step size 3 with record-breaking height 124. Found by Simon Cavegn of Switzerland in September 2023.

Submitted: 2023-09-23 04:27:21; Last Modified: 2023-09-23 04:56:39.