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Re: the 357 rule

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  • djbroadhurst
    ... n = 1097343303233 is not prime n is 2-PRP n is 3-PRP n is coprime to 3*5*7 n-1 is coprime to 3*5*7 There are 95 such counterexamples in
    Message 1 of 3 , Feb 1, 2010
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      --- In primenumbers@yahoogroups.com,
      Bill Bouris <leavemsg1@...> wrote:

      > I was going to say that if it were false
      > that a simple 3-PRP would expose those
      > numbers that did not have that property

      n = 1097343303233 is not prime
      n is 2-PRP
      n is 3-PRP
      n is coprime to 3*5*7
      n-1 is coprime to 3*5*7

      There are 95 such counterexamples in
      http://physics.open.ac.uk/~dbroadhu/cert/crxptrxp.gp
      the largest being n = 972137210279970593

      David
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