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RE prime form

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  • Jose Ramón Brox
    ... From: mcnamara_gio To: Sent: Monday, April 25, 2005 7:21 PM Subject: [PrimeNumbers] prime form
    Message 1 of 1 , Apr 25, 2005
      ----- Original Message -----
      From: "mcnamara_gio" <mcnamara_gio@...>
      To: <primenumbers@yahoogroups.com>
      Sent: Monday, April 25, 2005 7:21 PM
      Subject: [PrimeNumbers] prime form




      What do you think about this sequence a(n)=n^2+7n-1. Its terms are
      usually prime. I have calculated that 72% of a(n) so that n<500 is
      prime. 81% of a(n) is prime when n<5000. 85.6% of a(n) is prime when
      n<50000 and 88.5% of a(n) is prime when n<500000. I am going to find
      more prime terms in this sequence. What do you think about it?

      ----------------------------------

      I think that you have mistaken the percentages of no-primes with the percentages of
      primes. Can you recheck it?

      Jose Brox.
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