Fundamentals of Number Theory (Paperback)

1. Introduction
2. Unique Factorization and the GCD
3. Congruences and the Ring Zin
4. Primitive Roots and the Group Um
5. Quadratic Residues
6. Number-Theoretic Functions and the Distribution of Primes
7. Sums of Squares
8. Quadratic Equations and Quadratic Fields
9. Diophantine Approximation