> NO! The _correct_ formula is ceil((10^7-1)/log_10(2)) = 33219278. Aww, mine was pretty close ;-) > The point is that 2^n have 1 decimal digit for n < 4 ;-) > As it happens, 33219278, 33219279 & 33219280 are all composite and > therefore are not contenders for generating a Mersenne prime. > 33219281 _is_ prime, the status of 2^33219281 is (so far as I know) > not known at this time ... unless someone found a factor bigger than > my 2^40 search limit. Well, I don't think that 2^33219281 is prime (factors 1, and 2) :-). But 2^33219281-1 has no factor less than 2^52. No I am not searching in this range, but I made a made this a special case. I am currently searching between 2^47, and 2^50. Which should take almost two more months (unless I find a load of factors, that should make things go faster :) In that range, I an finding about 5.5% to have factors. If this holds, that would be about 3970 new factors, added on to all the other factors that I've found, that makes 19868 factors, less than half of those less than 2^40, despite the fact that the range I tested is 1023 times larger. I realize this is probably a FAQ, (and I intend to put it there), why is the distribution of factors so non-linear? -Lucas Wiman ________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm
