1471
This number is a prime.
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Starting with 2 at the top, there should be a palindromic prime pyramid of step size four of height around 1471.
Submitted: 2023-09-15 17:01:54; Last Modified: 2023-09-15 17:06:18.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell