Integer Function

A function defined for all positive integers, sometimes also called an arithmetic function (Nagell 1951, p. 26) or number theoretic function (Wilf 1994, p. 58).

REFERENCES:

Nagell, T. "Arithmetical Functions." §9 in Introduction to Number Theory. New York: Wiley, pp. 26-29, 1951.

Wilf, H. Generatingfunctionology, 2nd ed. New York: Academic Press, p. 58, 1994.