20060415, 19:42  #23  
Sep 2005
UGent
2^{2}×3×5 Posts 
Quote:


20060415, 20:29  #24 
Sep 2005
127 Posts 
Yes, I'm serious  I estimate (assuming all goes well  which is the point of the test) about 1 year to find the 20digit factor of (M+2)607. Interested?
About 8000 cpu years to find 40digit factor of similar numbers, about 64000000 cpu years to find 80digit factors, etc... [so I know which algorithm _I_ would prefer for big factors] This is using my (alreadywritten) Java code  if I were to rewrite it in C might be faster?? J 
20060415, 20:38  #25 
"Nancy"
Aug 2002
Alexandria
2,467 Posts 
Run it yourself. I don't mind if you waste your own cpu time, but don't waste others' by luring them into pointless endeavours with baseless claims.
Alex 
20060415, 22:21  #26 
Sep 2005
127 Posts 
It's not a baseless claim (I've already had promising results).
Lay off of my potential helpers! :) J 
20060415, 23:50  #27  
Nov 2003
2^{2}×5×373 Posts 
Quote:
It is strictly an exponential time algorithm and is actually worse than trial division. It is pointless. 

20060416, 02:24  #28 
Sep 2005
1111111_{2} Posts 
Trial division requires testing values of the 'base' up to the size of the factor. The results I'm already getting show that only a small percentage of the size of the factor is needed from the 'base' to find the factor. What's more this beneficial effect increases with size of factor.
Thinking theoretically, it is clear to me at least, that in the limit, the size of base needed for any size factor will tend to a constant (sic). How can this be worse than trial division!!!. Couple this fact with the polynomial/logarithmic time needed for each step (as I've already said, using Russian Peasant) and you get a polynomial/logarithmic algorithm. If you don't believe me  try it!! There's working programs there... 
20060416, 19:18  #29  
∂^{2}ω=0
Sep 2002
República de California
2^{2}·2,851 Posts 
Quote:
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20060816, 04:57  #30 
Sep 2005
127 Posts 
You may already be aware of the Mersenneplustwo project  but if not I'd like to bring it to your attention, pls...
http://bearnol.isageek.com/Mersenn...neplustwo.html thanks, J Last fiddled with by akruppa on 20060816 at 07:57 Reason: Post moved to "Tester(s) required" thread 
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