257
This number is a prime.
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If A = 1, B = 2, C = 3..., Z = 26, then 'MERSENNE PRIME EXPONENT' = 257, which Mersenne himself thought was a
Mersenne prime exponent but which was later proved to be incorrect. [Homewood]
Submitted: 2022-03-04 06:33:59; Last Modified: 2026-06-28 04:38:26.
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