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how many natural solutions are there to the following equation: $ \sum_{i=0}^k x_i^2 = n$ where $n,k \in\ \Bbb{N}$
i well like to get a answer for every n and k, but could do with just $k=2,3$.

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    See http://mathworld.wolfram.com/SumofSquaresFunction.html2012-09-21

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