books.google.co.uk - The book is mostly devoted to the study of the prime factors of integers, their size and their quantity, to good bounds on the number of integers with different properties (for example, those with only large prime factors) and to the distribution of divisors of integers in a given interval. In particular,...http://books.google.co.uk/books/about/Anatomy_of_Integers.html?id=3iHPwAS7F2AC&q=%22descartes+number%22&utm_source=gb-gplus-shareAnatomy of Integers