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Double Square Prime Numbers

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  • Milton Brown
    Starting with the interesting prime of 1210049 which equals 11*11*10000+7*7. This is good for generating primes because the sum of the digits is 17 and the
    Message 1 of 1 , Jun 16 9:21 AM
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      Starting with the interesting prime of 1210049 which
      equals 11*11*10000+7*7.

      This is good for generating primes because the sum of
      the digits is 17 and the alternating sum(+/-) is 5.
      Notice that 1+2+1 = 5 and 1-2+1 =0 preventing divisibilty
      by 3 and 11.

      So, here are some values of k for which
      11*11*10^k+7*7 are prime:

      1, 2, 4, 6, 20, 30, 68, 110, 136, 169, 198,217,225, 277, 308,
      510, 536, 1350, 1414, 1820, 1845,
      2*900+212, 2*900+238, 2*900+351, 2*900+724,

      Milton L. Brown

      [Non-text portions of this message have been removed]
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