Through its engaging and unusual problems, this book demonstrates methods of reasoning necessary for learning number theory. Every technique is followed by prob

This is a book about prime numbers, congruences, secret messages, and elliptic curves that you can read cover to cover. It grew out of undergr- uate courses tha

Number theory is an important research field of mathematics. In mathematical competitions, problems of elementary number theory occur frequently. These problems

This book, written by an accomplished female mathematician, is the second to explore nonstandard mathematical problems – those that are not directly solved by