Paul Baginski, Scott T. Chapman, Factorizations of Algebraic Integers, Block Monoids, and Additive Number Theory, The American Mathematical Monthly, Vol. 118, No. 10 ...

The list represented counts of how many ways a given whole number can be expressed as a sum of positive integers. For example, 4 can be written as 3 + 1, 2 + 2, 2 + 1 + 1, and 1 + 1 + 1 + 1.

Grzegorz Banaszak, Algebraic K-Theory of Number Fields and Rings of Integers and the Stickelberger Ideal, Annals of Mathematics, Vol. 135, No. 2 (Mar., 1992), pp. 325-360 ...

Number theory, the study of the properties of positive integers, is perhaps the purest form of mathematics. At first sight, it may seem far too abstract to apply to the natural world.