The new Second Edition of Neville Robbins’ Beginning Number Theory is a rich yet flexible account of classic number theory, blending in numerous applications and specialized treatments of many essential topics, including Cryptology, Fibonacci Numbers, and Computational Number Theory. It strikes a balance between the traditional and algorithmic approaches to elementary number theory and is supported with numerous exercises, applications, and case studies throughout. Beginning Number Theory is appropriate for use in a one-semester, undergraduate number theory course. It is robust with interesting facts, historical notes, and modern applications, yet is clear and manageable for introductory students. With 21” century applications available online, this text is truly an entertaining and comprehensive introduction to number theory.