books.google.com - Modern number theory began with the work of Euler and Gauss to understand and extend the many unsolved questions left behind by Fermat. In the course of their investigations, they uncovered new phenomena in need of explanation, which over time led to the discovery of field theory and its intimate connection...http://books.google.com/books/about/Primes_of_the_Form_x_+_ny.html?id=tlTZC-k-l2EC&q=proof+of+Theorem&utm_source=gb-gplus-sharePrimes of the Form x + ny