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Math Help - need help disproving

  1. #1
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    need help disproving

    for all n>=3 prove that 2n+1 does not divide 3^2^(n-2) - 1
    i have figured out by crunching numbers that 2n divides 3^2^(n-2) - 1 but having trouble trying to start a proof. any help appreciated.
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  2. #2
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  3. #3
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    Re: need help disproving

    so prove it does not work for n=3, then show it does not work for n=4? i feel as though there should be a more solid proof than that.
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  4. #4
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    Re: need help disproving

    It's a general inductive proof. You show for n=3, assume for n-1, and show it holds for n.
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