193

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 three and height around 193 (ending with a titanic prime), but to find the tallest such pyramid by exhaustive search would be beyond the world's current computer abilities!

Submitted: 2023-09-12 22:25:23; Last Modified: 2026-06-20 00:37:37.