12233...33221 (25-digits)

This number is a prime.

12233 3444455555 4444333221

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A palindromic prime which is the concatenation of one 1, two 2's, three 3's, four 4's, five 5's, then the ten descending digits returning to 1. [Tuấn]

Submitted: 2023-09-09 12:11:05; Last Modified: 2023-09-09 16:54:10.