An Introduction to the Theory of NumbersDivisibility. Congruences. Quadratic Reciprocity and Quadratic Forms. Some Functions of Number Theory. Some Diophantine Equations. Farey Fractions and Irrational Numbers. Simple Continued Fractions. Primes and Multiplicative Number Theory. Algebraic Numbers. The Partition Function. The Density of Sequences of Integers. Appendices. General References. Hints. Answers. Index.