71111...11117 (27-digits)

This number is a prime.

7111111 1111197911 1111111117

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711111111111979111111111117 is the palindromic prime formed from the concatenated edges of a 3D Trigonal Palindromic Prime Pyramid of Step 3, with height 27 starting with 7. [Sariyar]

Submitted: 2026-06-13 14:58:48; Last Modified: 2026-06-13 22:56:34.