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Re: Little puzzle

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  • j_chrtn
    ... Hint #2: a(7) starts with a 4 and ends with 20. J-L
    Message 1 of 2 , Sep 13, 2012
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      --- In primenumbers@yahoogroups.com, "j_chrtn" <j_chrtn@...> wrote:
      >
      > Hints: think of Mersenne's numbers...
      >

      Hint #2: a(7) starts with a 4 and ends with 20.

      J-L
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