33333...33333 (1553-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 smallest titanic palindromic prime in which a single digit is sandwiched between strings of 3's. [Gupta]

Submitted: 2026-04-23 02:27:25; Last Modified: 2026-04-23 10:43:55.