2377
This number is a prime.
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A prime divisor of the 1747-digit composite 720!+1 = ((3!)!)!+1; 720!+1 = 2377 × 124291 × C, where C is a 1738-digit composite whose smallest prime factor exceeds 10,017,530,827. [Demi-Suwen]
Submitted: 2026-09-20 01:10:42; Last Modified: 2026-09-20 23:53:05.
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