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Math Help - Divisibility 7

  1. #1
    Sea
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    Divisibility 7

    Show that: a,b\in \mathbf{Z^{+}} and  b>2 \Rightarrow 2^{a}+1\nmid2^{b}-1
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  2. #2
    o_O
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    What about: a = 3, \ b = 6

    2^3 + 1 = 9 \mid 63 = 2^6 - 1
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