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Topics in the Theory of Numbers (Undergraduate Texts in Mathematics)
ISBN 0387953205 / 9780387953205 / 0-387-95320-5
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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. [via]