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[PrimeNumbers] Re: adding to prime number

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  • Jens Kruse Andersen
    ... We can go further by subtracting: 3*7*17*29*31*37 - 2*5*11*13*19^2*23 2^2*3*5^2*19*23*37*41 - 7*11*13^2*17*29*31 But we cannot evaluate them almost
    Message 1 of 3 , Sep 14, 2011
      Mark wrote:
      > --- In primenumbers@yahoogroups.com, Kermit Rose <kermit@...> wrote:
      >> What elementary principle of algebra allows us to know almost instantly
      >> that the following calculated integers are prime?
      ...
      >> 2^2 * 3^2 + 5
      > Kermit, lest we forget
      >
      > 2*3*5 + 7

      We can go further by subtracting:
      3*7*17*29*31*37 - 2*5*11*13*19^2*23
      2^2*3*5^2*19*23*37*41 - 7*11*13^2*17*29*31

      But we cannot evaluate them almost instantly.

      --
      Jens Kruse Andersen
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