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FilledSmallSquareDivisorSigma[k, n] gives the divisor function .

FilledSmallSquare Integer mathematical function (see Section A.3.10).

FilledSmallSquare is the sum of the powers of the divisors of .

FilledSmallSquareDivisorSigma[k, n, GaussianIntegers -> True] includes divisors that are Gaussian integers.

FilledSmallSquare See The Mathematica Book: Section 3.2.4.

FilledSmallSquare See also: EulerPhi.

Further Examples