Elementary Number Theory

Some preliminary considerations; divisibility theory in the integers; primes and their distribution; the theory of congruences; Fermat's theorem; number-theoretic functions; Euler's generalization of Fermat's theorem; primitive roots and indices; the quadratic reciprocity law; perfect numbers; the Fermat conjecture; representation of integers as sums of squares; Fibonacci numbers; continued fractions; some 20th-century developments; appendices.