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On an Arithmetical Function
Authors:Email author" target="_blank">Hershel M?FarkasEmail author
Institution:(1) The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
Abstract:In this paper we introduce an arithmetical function delta(n), the difference between the number of divisors of n congruent to 1 mod 3 and those congruent to –1 mod 3. This function then is related to the classical function sgr(n) which is the sum of the divisors of n. In particular we prove the identity
$$3\bigg(\sum_{n=0}^{\infty}\delta(3n+1)x^n\bigg)^2=\sum_{n=0}^{\infty}\sigma(3n+2)x^n.$$
Keywords:theta functions  divisor functions
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