 Waring's problem for squares (source code)

by Ciro Santilli (@cirosantilli, 37)

= Waring's problem for squares
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4 squares are sufficient by <Lagrange's four-square theorem>.

3 is not enough by <Legendre's three-square theorem>.

The subsets reachable with 2 and 3 squares are fully characterized by <Legendre's three-square theorem> and 

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