how to gcd of two numbers?
Greatest common divisors can in principle be computed by determining the prime factorizations of the two numbers and comparing factors, as in the following example: to compute gcd(18, 84), we find the prime factorizations 18 = 2 · 32 and 84 = 22 · 3 · 7 and the "overlap" of the two expressions is 2 · 3; so gcd(18, 84) ...