In number theory, the sum of squares function is an arithmetic function that gives the number of representations for a given positive integer n {\displaystyle n} as the sum of k {\displaystyle k} squares, where representations that differ only in the order of the summands or in the signs of the numbers being squared are counted as different. It is denoted by r k ( n ) {\displaystyle r_{k}(n)} .
In number theory, the sum of squares function is an arithmetic function that gives the number of representations for a given positive integer n {\displaystyle n} as the sum of k {\displaystyle k} squares, where representations that differ only in the order of the summands or in the signs of the numbers being squared are counted as different. It is denoted by r k ( n ) {\displaystyle r_{k}(n)} .
Source: Wikipedia "Sum of squares function" · CC BY-SA 4.0
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