10000...00001 (31-digits)

This number is a prime.

1 0000000000 0007770000 0000000001

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1000000000000077700000000000001 is the second Seraph prime. See Atlas Obscura. [Grundhauser]

Submitted: 2026-01-19 03:01:29; Last Modified: 2026-01-19 03:14:27.