For beginners in number theory, Tom M. Apostol's "Introduction to Analytic Number Theory" is recommended for its accessibility. Other suggested texts include "Prime Numbers: A Computational Perspective" by Richard Crandall and Carl Pomerance, and "Algorithmic Number Theory" by Bach and Shalit. The discussion also highlights the importance of exercises in learning, with mentions of "Number Theory: A Lively Introduction" and "Elementary Number Theory in Nine Chapters," although both lack answer keys. Engaging books like "Fermat's Enigma" are noted for their historical context rather than rigorous mathematical content. Overall, a mix of accessible and more advanced texts is advised for those starting in number theory.