Not a Mersenne prime, but what is it?

Discussion in 'Number Theory' started by paulejking, Jul 26, 2021.

  1. paulejking

    paulejking

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    Hi folks:

    This is an amateur question regarding Mersenne Primes. I understand they are of the form 2^n - 1. I have always stored that away in my mind as "one off" from a power of 2. But the number 17 doesn't fit that idea, since it is 17 = 2^4 + 1. It is one-off from a power of 2, but the 1 is added instead of subtracted. Is there a name for these other kind of primes?

    Paul
     
    paulejking, Jul 26, 2021
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  2. paulejking

    BobLeMagnifik

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    BobLeMagnifik, Jun 26, 2022
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