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Re: Sequence

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  • Mark
    ... In addition, the five numbers are each one less than a prime.
    Message 1 of 5 , Jan 19, 2011
      --- In primenumbers@yahoogroups.com, Jack Brennen <jfb@...> wrote:
      >
      > Where did you get the numbers, I'm wondering...
      >
      > One thing I noticed was that for each of your N, sigma(N) is
      > divisible by 7 and 19-smooth (no prime divisors > 19).
      >
      > However, there are probably thousands of other numbers less
      > than 6158856 which have sigma(N) very smooth and divisible by 7,
      > so there must be more to it. Still, I have to think that whatever
      > these numbers have in common somehow ties in with the smoothness
      > of sigma(N); the divisibility by 7 may be a coincidence.
      >

      In addition, the five numbers are each one less than a prime.


      >
      >
      > On 1/17/2011 12:32 PM, Di Maria Giovanni wrote:
      > > Hi
      > > Does it exist a formula to generate the following numbers?
      > >
      > > 36
      > > 540
      > > 39508
      > > 667332
      > > 6158856
      > >
      > > Regards
      > > Giovanni
      > >
      > >
      > >
      > >
      > >
      > > ------------------------------------
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      > >
      > >
      > >
      > >
      > >
      >
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