Problem #17

For which values of n is it possible to split the sum 1^2+2^2+3^2+...+n^2 into two equal sums? For example 1^2+2^2+3^2 cannot be split into two equal sums, but 1^2+2^2+...+7^2 can be split into 1^2+2^2+4^2+7^2 and 3^2+5^2+6^2.

Compare to last week's problem.

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