Show that there is only one integer n ( > 1) such that(adsbygoogle = window.adsbygoogle || []).push({});

[URL]http://latex.codecogs.com/gif.latex?1^2+2^2+\cdots+n^2=\frac{n(n+1)(2n+1)}{6}[/URL]

is a perfect square

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# Make 1+4+ +n^2 perfect square

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