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21297Re: {Spam?} [PrimeNumbers] the 357 rule

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  • Paul Leyland
    Feb 1, 2010
      If you used your elderly computer to search for known results rather
      than for computations you would have discovered
      http://www.research.att.com/~njas/sequences/A055550 and, in particular,
      the entry 264239

      264239 = 139 * 1901
      264238 = 2 * 13 * 10163


      Paul


      On Mon, 2010-02-01 at 06:18 -0800, Bill Bouris wrote:
      >
      > Group,
      > I believe that if 'N' passes the 2-PRP test that either 3, 5, or 7
      > divides 'N-1', one or
      > all of them, or 'N' will be divisible by 3, 5, or 7 and be composite.
      > I could only go
      > so far with my outdated computer and UBasic. Can anyone find a
      > counter-example ???
      > Bill
      >
      >
      >
      >
      >
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