ABSTRACT
Throughout this chapter we put Z — {1 , 2 ,**}. An arithmetical function f(n) is a real or complex valued function whose domain is either a subset of, or the whole set Z . Thus, there is no difference between the arithmetical function f(n) or the sequence / n, n > 1 , except that when we call a sequence a function then the emphasis on /(n) is the values of f(n) based on the arithmetical structure of n.
