- #1
elimqiu
- 11
- 0
Show that there is only one integer n ( > 1) such that
[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
[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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