Introduction to Arithmetical Functions (Universitext)

Arithmetical Functions: An Introduction to Elementary and Analytic Properties of Arithmetic Functions and to Some of Their Almost-Periodic Propertie: ... Lecture Note Series, Series Number 184)

Introduction to the Arithmetic Theory of Automorphic Functions (Publications of the Mathematical Society of Japan, Vol. 11)

The Higher Arithmetic: An Introduction to the Theory of Numbers

Nicomachus' Introduction to Arithmetic (Texts of the Quadrivium)