101

This number is a prime.

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The two largest known pi-primes (primes formed by first n digits of pi) have 613373 digits and 78073 digits. Interestingly, both 613373 and 78073 are semiprimes whose smallest prime factor is 101. [Gudipati]

Submitted: 2026-05-07 07:55:11; Last Modified: 2026-05-07 10:39:36.