books.google.com - Number Theory or arithmetic, as some prefer to call it, is the oldest, purest, liveliest, most elementary yet sophisticated field of mathematics. It is no coincidence that the fundamental science of numbers has come to be known as the "Queen of Mathematics." Indeed some of the most complex conventions...http://books.google.com/books/about/Number_Theory.html?id=XSV0hDFj3loC&utm_source=gb-gplus-shareNumber Theory