Prime Curios!: 12233...33221 (25-digits)

12233...33221 (25-digits)
(another Prime Pages' Curiosity)

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12233 3444455555 4444333221

A palindromic prime formed from the first five digits, where each digit d is repeated d times in ascending and descending order. [Silva]

This palindromic prime of 5-by-5 digits consists of five 5's, surrounded on each side by four 4's, three 3's, two 2's and one 1. (The only other similar prime is 122333221.) [Hasler]

This prime can take a pyramidal form whose base is a palindrome with the first five digits: 5 454 34543 2345432 123454321. [Silva]