10000...00001 (25-digits)

This number is a prime.

10000 0000007770 0000000001

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The palindrome 1000000000077700000000001 is the smallest Seraph prime. Note the 20 zeros. [Bise]

Submitted: 2026-01-19 00:47:02; Last Modified: 2026-01-19 02:54:53.