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Divisor function
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==External links== * {{mathworld|urlname=DivisorFunction|title=Divisor Function}} * {{mathworld|urlname=RobinsTheorem|title=Robin's Theorem}} * [http://mathstat.carleton.ca/~williams/papers/pdf/249.pdf Elementary Evaluation of Certain Convolution Sums Involving Divisor Functions] PDF of a paper by Huard, Ou, Spearman, and Williams. Contains elementary (i.e. not relying on the theory of modular forms) proofs of divisor sum convolutions, formulas for the number of ways of representing a number as a sum of triangular numbers, and related results. {{Divisor classes}} <!-- [[hu:Osztóösszeg-függvény]] [[pl:Funkcja σ]] --> {{DEFAULTSORT:Divisor function}} [[Category:Divisor function| ]] [[Category:Analytic number theory]] [[Category:Number theory]] [[Category:Zeta and L-functions]]
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