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Unsolved Problems in Number Theory is written by Richard Guy and published by Springer Science & Business Media. It's available with International Standard Book Number or ISBN identification 0387208607 (ISBN 10) and 9780387208602 (ISBN 13).
Mathematics is kept alive by the appearance of new, unsolved problems. This book provides a steady supply of easily understood, if not easily solved, problems that can be considered in varying depths by mathematicians at all levels of mathematical maturity. This new edition features lists of references to OEIS, Neal Sloane’s Online Encyclopedia of Integer Sequences, at the end of several of the sections.