What's so interesting about squared numbers? Lagrange's Four Square Theorem

Lagrange's four-square theorem - Wikipedia

Table 3 from Extended Lagrange's four-square theorem

Lagrange's four-square theorem, polynomials, diophantine equations, prime numbers

PDF) Algebraic Consequences of Jacobi's Two- and Four-Square Theorems

Lagrange's Four-Square Theorem Seen Using Polygons and Lines

Lagrange's Four Square Theorem

Lagrange's three square theorem

SOLVED: In the following sequence of problems, we will start the proof of the Four-Square Theorem conjectured in the third century by Diophantus and proven by Lagrange in 1770 (since it took

Solved 4. [12 marks] The Modular Operation x mod m = r

Proving the Pythagorean Theorem. Some algebraic and geometric proofs of…, by Michele Diodati, Not Zero