137

This number is a prime.

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The smallest prime factor of the form 6k-1 of 2^p-1 for all primes p less than 137 is such that the integer (3k-1)/p has at most 7 digits. At p=117, it's 17. [Garcia]

Submitted: 2020-05-23 22:19:29; Last Modified: 2021-01-02 21:48:03.