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Weighted Gcd-Sum Functions
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László Tóth

Department of Mathematics

University of Pécs

Ifjúság u. 6

7624 Pécs

Hungary

and

Institute of Mathematics

Department of Integrative Biology

Universität für Bodenkultur

Gregor Mendel-Straße 33

A-1180 Wien

Austria

**Abstract:**

We investigate weighted gcd-sum functions, including
the alternating gcd-sum function and those having as weights the
binomial coefficients and values of the Gamma function. We also
consider the alternating lcm-sum function.

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(Concerned with sequences
A001783
A002109
A018804
A051193
A056188
A159068.)

Received May 11 2011;
revised version received July 18 2011.
Published in *Journal of Integer Sequences*, September 5 2011.

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