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Results tagged with sums-of-squares
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user 28104
16
votes
The four-square theorem from the Gauss-Legendre three-square theorem
The three squares theorem tells you that a positive integer $n$ can be represented as the sum
of 3 squares if and only if it is not of the form $n = 4^a(8b+7)$, see e.g.
http://www.proofwiki.org/wiki/ …
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