31415...51413 (921-digits)

This number is a prime.

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As of June 2008, the largest known 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: 2009-09-23 19:29:52;   Last Modified: 2022-02-28 02:55:10.
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