Loading ...
Sorry, an error occurred while loading the content.

23050Re: [PrimeNumbers] Re: A PRP of the form 2*k*p +1

Expand Messages
  • Maximilian Hasler
    Sep 1, 2011
    • 0 Attachment
      >> 2*(10^100000 + 50617) + 1 as a probable prime of 100006 digits;

      >
      > Am I missing something, according to Mathematica:
      >
      >  2*(10^100000+50617) + 1 ends in a 5

      no need to use Mathematica for that:

      2*7 = 14 ; + 1 = 15 .

      Indeed a quite improbable prime.

      > 2*(10^100000*50617) + 1 is divisible by 967 & 23473

      This I cannot confirm, according to PARI, divisors < 5e5 are:
      5,36263 for 2*(10^100000+50617) + 1
      3,7,17,19 for 2*(10^100000+50617) - 1
      3,17,19,23473 for 2*(10^100000*50617) + 1
      11,167 for 2*(10^100000*50617) - 1

      But in fact the " * " versions don't make sense
      (why the "2" would be outside and 50617 inside the (...) ?)

      Maximilian
    • Show all 9 messages in this topic