On the Bi-Unitary Analogues of Euler's Arithmetical Function and the Gcd-Sum Function
László Tóth
Institute of Mathematics and Informatics
University of Pécs
Ifjúság u. 6
7624 Pécs
Hungary
Abstract:
We give combinatorial-type formulae for the bi-unitary
analogues of Euler's arithmetical function and the gcd-sum function
and prove asymptotic formulae for the latter one and for another
related function.
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(Concerned with sequences
A000010
A001221
A005361
A008683
A018804
A047994
A145388.)
Received April 24 2009;
revised version received June 22 2009.
Published in Journal of Integer Sequences, June 23 2009.
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