Table of contents15.1 The Primes of k(i)15.2 Fermat’s Theorem in k(i)15.3 The Primes of k(p)15.4 The Primes of k(\sqrt 2) and k(\sqrt 5)15.5 Lucas’s Test for the Primality of the Mersenne Number M_{4n + 3}15.6 General Remarks on the Arithmetic of Quadratic Fields15.7 Ideals in a Quadratic Field15.8 Other Fields15.1 The Primes of k(i) 15.2 Fermat’s Theorem in k(i) 15.3 The Primes of k(p) 15.4 The Primes of k(2) and k(5) 15.5 Lucas’s Test for the Primality of the Mersenne Number M4n+3 15.6 General Remarks on the Arithmetic of Quadratic Fields 15.7 Ideals in a Quadratic Field 15.8 Other Fields