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Phi(2^a*3^b,10)

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  • d.broadhurst@open.ac.uk
    ... In fairness, I should highlight the smiley, lest folk fall into the trap of trying values of n with prime divisors greater than 3. Feeding pfgw the
    Message 1 of 1 , Aug 3, 2001
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      Mischeviously, I wrote:

      > f(n)=(10^(6*n)+1)/(10^(2*n)+1)
      > f(1)= 9901 is prime
      > f(2)= 99990001 is prime
      > f(3)= 999999000001 is prime
      > f(4)= 9999999900000001 is prime
      > Puzzle: Find the next prime of this form :-)

      In fairness, I should highlight the smiley,
      lest folk fall into the trap of trying values
      of n with prime divisors greater than 3.

      Feeding pfgw the following ABC2 file,
      I found nothing new:

      ABC2 Phi(2^$a*3^$b,10)
      a: from 2 to 6
      b: from 1 to 5

      so the heuristics are truly grim!

      David
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