31415...51413 (921-digits)

This number is a prime.

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A palindromic prime formed from the reflected decimal expansion of π. Primality proved by Dr. Thomas Spahni of Switzerland using François Morain's ECPP-V6.4.5a.

Submitted: 2023-09-15 02:52:13; Last Modified: 2026-04-05 19:39:12.