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Math Help - how to start ??

  1. #1
    Newbie
    Joined
    Nov 2008
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    13

    how to start ??

    If 2k+1 and 3k+1 are squares then prove that k is divisible by 40
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  2. #2
    Super Member
    Joined
    May 2009
    Posts
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    I thought that I've seen this problem before. See this site for a proof: mathschallenge.net.


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