Ramanujan's Sum and Nagell's Totient Functio for Arithmetical Semi-Groups.
An extension of Daykin's generalized Möbius function to unitary divisors.
The average order of the number of generalised integers representable as a product of a prime and a square.
Exponential functions for arithmetical semi-groups.
Unitary divisor functions of a generalised integer
Normal order for divisor functions of generalized integers
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