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On sums of logarithmic averages of gcd-sum functions

Number Theory 2018-04-06 v1

Abstract

Let gcd(k,j)\gcd(k,j) be the greatest common divisor of the integers kk and jj. For any arithmetical function ff, we establish several asymptotic formulas for weighted averages of gcd-sum functions with weight concerning logarithms, that is kx1kj=1kf(gcd(k,j))logj.\sum_{k\leq x}\frac{1}{k} \sum_{j=1}^{k}f(\gcd(k,j)) \log j. More precisely, we give asymptotic formulas for various multiplicative functions such as f=idf=id, ϕ\phi, id1+aid_{1+a} and ϕ1+a\phi_{1+a} with 1<a<0-1<a<0. We also establish some formulas of Dirichlet series having coefficients of the sum function j=1ksk(j)logj\sum_{j=1}^{k}s_{k}(j)\log j where sk(j)s_{k}(j) is Anderson--Apostol sums.

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Cite

@article{arxiv.1804.01902,
  title  = {On sums of logarithmic averages of gcd-sum functions},
  author = {Isao Kiuchi and Sumaia Saad Eddin},
  journal= {arXiv preprint arXiv:1804.01902},
  year   = {2018}
}

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21 Pages