Hi, I only have a small question, I think it was mentioned on the list once or twice but I can't find it. I was wandering how to calculate the probability to find a factor, of a mersenne number, in a giving range? what's the probability of finding a factor of M(p) between 2^n and 2^(n+1) ? Thanks, David, ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com