factoring of special numbers.
4 + the fourth power of an odd positive integer greater than 1, is always composite. Let b be an odd positive integer greater than 1. Note that if b > 1, then (b^2 - 2 b + 2) is greater than 1. (b^2 - 2 b + 2) * (b^2 + 2 b + 2) = (b^2 + 2 - 2 b) * (b^2 + 2 + 2 b) = (b^2 + 2)^2 - (2 b)^2 = (b^4 + 4... Sign in to see full entry.