A Survey of Gcd-Sum Functions

@inproceedings{Tth2010ASO,
  title={A Survey of Gcd-Sum Functions},
  author={L{\'a}szl{\'o} T{\'o}th},
  year={2010}
}
We survey properties of the gcd-sum function and of its analogs. As new results, we establish asymptotic formulae with remainder terms for the quadratic moment and the reciprocal of the gcd-sum function and for the function defined by the harmonic mean of the gcd’s. 

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