CONTENTS:-
1. INTRODUCTION, 2. DIVISIBILITY THEORY, 3. LINEAR DIOPHANTINE EQUATIONS, 4. PRIMES AND THEIR DISTRIBUTIONS, 5. CONGRUENCES, 6. FERMETS THEOREM AND ITS APPLICATIONS, 7. NUMBER THEORETIC FUNCTIONS, 8. PRIMITIVE ROOTS AND INDICES, 9. QUADRATIC RESIDUES AND CONGRUENCES OF SECOND DEGREE, 10. PERFECT NUMBERS, 11. SUM OF SQUARES OF INTEGERS, 12. SELECTED TOPICS