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Little puzzle

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  • j_chrtn
    Hello group, What is the next term of the following serie a(n): a(1) = 2 a(2) = 2 a(3) = 2 a(4) = 296 a(5) = 369719 a(6) = 457578 a(7) = ? Opened question: is
    Message 1 of 2 , Sep 11, 2012
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      Hello group,

      What is the next term of the following serie a(n):

      a(1) = 2
      a(2) = 2
      a(3) = 2
      a(4) = 296
      a(5) = 369719
      a(6) = 457578
      a(7) = ?


      Opened question: is a(n) infinite ?

      Hints: think of Mersenne's numbers...


      Jean-Louis
    • j_chrtn
      ... Hint #2: a(7) starts with a 4 and ends with 20. J-L
      Message 2 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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