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#1

$Old$ July 11th, 2009, 02:04 AM

newtoinequality $newtoinequality is offline$

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$Default$ how to start ??

If $2k+1$ and $3k+1$ are squares then prove that $k$ is divisible by $40$

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#2

$Old$ July 11th, 2009, 02:22 AM

yeongil $yeongil is offline$

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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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