756839

This number is a prime.

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The Mersenne prime with exponent 756839 is the smaller of four consecutive Mersenne primes that exist between consecutive perfect numbers. This is the one and only (not to mention the largest) known case of 4. Observation by Metin Sariyar of Turkey.

Submitted: 2020-06-29 13:17:36; Last Modified: 2020-06-29 22:38:33.