Erdos Paul, Suranyi Janos. Topics in the theory of numbers

Springer, 2003. — 287 p. — ISBN: 0-387-95320-5.Number theory, the branch of mathematics that studies the properties of the integers, is a repository of interesting and quite varied problems, sometimes impossibly difficult ones. In this book, the authors have gathered together a collection of problems from various topics in number theory that they find beautiful, intriguing, and from a certain point of view instructive.