20201019, 19:20  #12  
Nov 2014
3×13 Posts 
Quote:


20201020, 08:50  #13 
"Viliam Furík"
Jul 2018
Martin, Slovakia
2^{3}·3^{2}·11 Posts 
TFed to 78bits
I TFed the M20825573 to 78 bits, 79 is on the way. So far, no factor.

20201020, 20:18  #14 
Nov 2014
100111_{2} Posts 
Hihi, thanks for that! My laptop GPU is too crappy for this bitlevels. However, I assume your chances for success are quite low because of the large P1 and the ECM curves I already ran. I won't continue on this number for now, back to boring PRP testing...

20211029, 09:31  #15 
"University student"
May 2021
Beijing, China
2^{2}×67 Posts 
Factoring M19491001
I'd like to factor M19491001, just because the way it looks.
I did TF to 2^75 and dozens of ECM curves because I noticed that a prior P1 has been done. So far, no factor was found. Should I do P+1 or try P1 with larger bounds? 
20211029, 14:24  #16 
"Curtis"
Feb 2005
Riverside, CA
2^{2}×3×7×67 Posts 
I wouldn't do another P1 until I'd finished the B1 = 50k ECM level. I'd do a few curves at B1=250k also before repeating P1.
If I did another P1. I'd increase the bounds by 10x or so. You have to redo all the work of the previous P1, so increasing bounds just a little bit means you're mostly wasting work (and thus that there are better ways to use those cycles). P+1 seems like a reasonable choice again, pick big bounds big enough that you won't be tempted to try evenbigger ones later. How big to pick depends quite a bit on how much effort you want to spend on this factoring effort completing the B1=50k level is nontrivial, but completing the B1=250k level is a pretty serious effort. If you intend to go that far, choose bigger P+1 (and maybe P1) bounds than would normally be reasonable. 
20211029, 14:39  #17  
"Viliam Furík"
Jul 2018
Martin, Slovakia
792_{10} Posts 
Quote:


20211125, 22:46  #18  
Nov 2014
27_{16} Posts 
Quote:


20211125, 23:14  #19 
P90 years forever!
Aug 2002
Yeehaw, FL
2^{3}×1,019 Posts 

20220424, 00:30  #20 
"mrh"
Oct 2018
Temecula, ca
1011010_{2} Posts 

20220424, 02:18  #21  
"Curtis"
Feb 2005
Riverside, CA
2^{2}·3·7·67 Posts 
Quote:
Using 30.8 with a bunch of memory (16GB or more), I imagine B1 = 50M with the big B2 from 30.8 will give you something like 78% chance to find a factor. Again, don't do a calculation that you'll be tempted to redo later. Do P1 once, so big you won't ever consider repeating it. Last fiddled with by VBCurtis on 20220424 at 02:19 

20220506, 05:10  #22 
Romulan Interpreter
"name field"
Jun 2011
Thailand
10,273 Posts 

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