Dear Dodo, thanks for your interest. Its a rather clumsy proof, But I started it from the fact, that IF a such perfect number exists, if we factorize it to primes, ALL the possible combinations of multipled primes fe: p1*p2*p3 gives the combinations p1*p2, p2*p3, p1*p3, p1, p2,p3 and 1. Those...