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Math Help - Triangular,squre,pentagonal number

  1. #1
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    Triangular,squre,pentagonal number

    Is there a number,aside from 1,simultaneously triangular,squre,pentagonal number ?
    that is, is there a L=(3n^2-n)/2=(k^2+k)/2=m^2
    for some m,n,k are positive integers.
    Last edited by chipai; April 22nd 2009 at 11:10 AM.
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  2. #2
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