Elementary Methods in Number Theory - Melvyn B. Nathanson, Springer-Verlag - Google Books

http://books.google.de/books?id=TVjCVHufu8YC&pg=PA187

Elementary Methods in Number Theory begins with "a first course in number theory" for students with no previous knowledge of the subject. The main topics are divisibility, prime numbers, and congruences. There is also an introduction to Fourier analysis on…