What's so interesting about squared numbers? Lagrange's Four Square Theorem
Por um escritor misterioso
Descrição
Pick a number and try to express it as the sum of four squared numbers. Well, that is Lagrange's four square theorem.
Lagrange's Four-Square Theorem Seen Using Polygons and Lines
Euler Four-Square Identity -- from Wolfram MathWorld
Square number - Wikipedia
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In how many ways can 1260 be expressed as the difference of the squares of natural numbers and integers? - Quora
Euler's Calculation of the Sum of the Reciprocals of the Squares: A Mini-Primary Source Project for Calculus 2 Students
Square Number Definition & Meaning
Square Number -- from Wolfram MathWorld
Stable/Patient Sort: Bit-Manipulation-To-Solve-Problems-Easily-And-Efficiently, PDF, Square Root
Table 3 from Extended Lagrange's four-square theorem
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