Discrete quantum computation and Lagrange's four-square theorem

LAGRANGE'S FOUR SQUARE THEOREM Theorems, Lagrange theorem, Number theory

Table 3 from Extended Lagrange's four-square theorem

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

Square Number Definition & Meaning

GitHub - HechenHu/Four-Square_Representation: Using Rabin and Shallit's Algorithm to compute the four-square representation of a natural number as stated in Lagrange's Four-square Theorem.

Why was this visual proof missed for 400 years? (Fermat's two square theorem)

Sum of two squares theorem - Wikipedia

Stable/Patient Sort: Bit-Manipulation-To-Solve-Problems-Easily-And-Efficiently, PDF, Square Root

Sum of squares, Part-2, Sum of four squares

Sum of Squares Function -- from Wolfram MathWorld