31415...36307 (16208-digits)

This number is a prime.

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The first known gigantic prime in the decimal expansion of π. Proven prime by Robert Baillie using Primo in May 2026. Running 24 threads, it took approximately 15.5 days on a HP ZBook laptop.

Submitted: 2001-12-22 17:33:23; Last Modified: 2026-05-14 15:14:36.