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Well, we have missed some SMALL twins.

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  • Andrey Kulsha
    Hello! ... digits] ... Oh, yes! I ve just tried this with Manual PMax option disabled, and all works OK. But if I use this option (PMax=1048576), Proth
    Message 1 of 1 , Feb 16, 2001
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      Hello!

      > It tests it:
      >
      > 9*10^3 + 1 may be prime. (a = 2)
      > 9*10^3 + 1 is prime ! (a = 7) [4 digits]
      > 9*10^3 + 1 is prime ! (verification : a = 13) [4 digits]
      > 9*10^3 - 1 may be prime. (a = 2)
      > 9*10^3 - 1 is prime ! (P = 8, Q = -1) [4 digits]
      > 9*10^3 - 1 may be prime. (P = 9, Q = -1)
      > 9*10^3 - 1 is prime ! (verification : P = 12, Q = -1) [4
      digits]
      > - Twin -
      >
      > ???

      Oh, yes!

      I've just tried this with "Manual PMax" option disabled, and
      all works OK.

      But if I use this option (PMax=1048576), Proth doesn't want
      to test some small numbers for existence of twin pair (and,
      perhaps, another good pairs). Proth proves primality of them
      with trial division and maybe therefore such bug occurs.

      Best wishes,

      Andrey
      ---
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