89

This number is a prime.

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If A = 1, B = 6, C = 1, D = 8, ... , (using the digits of the Golden Ratio), then 'MERSENNE PRIME NUMBER' = 89; a Mersenne prime exponent that Mersenne himself missed! [Homewood]

Submitted: 2018-04-26 17:45:18; Last Modified: 2018-04-26 18:52:17.