136279841

This number is a prime.

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136279841 is the exponent of the largest known Mersenne prime (as of 20 Novvember 2025) and also a happy number, which was reported by Simon Cavegn. See Puzzle 21. [Rivera]

Submitted: 2025-11-20 22:36:31; Last Modified: 2025-11-20 22:53:58.