20110127, 14:41  #89 
"Mark"
Feb 2003
Sydney
3×191 Posts 
Three very nearly in a row!
M2909701 has a factor: 34116886410693051247
k = 3 * 41^2 * 1913 * 607697 M2909749 has a factor: 165757446506320718519 k = 7 * 2417 * 7477 * 225157 M2909827 has a factor: 17618623784616481399 k = 3^3 * 257 * 281 * 1552643 All in P1 stage #2, B1=105000, B2=2283750, E=6. I keep thinking I should reduce the bounds... 
20110127, 16:53  #90 
Aug 2002
Buenos Aires, Argentina
2·691 Posts 
ECM testing in M800xxx area
After running 220 ECM curves with B1=50000 for 12 numbers in the M800xxx area I found:
M800123 has a factor: 39697452239411289096120887 M800131 has a factor: 1236262353488699154645983 M800351 has a factor: 499211152072761829658937337 M800731 has a factor: 42794895872489861161754233 
20110127, 17:09  #91  
Sep 2010
Annapolis, MD, USA
3^{3}·7 Posts 
Quote:


20110127, 17:17  #92 
Aug 2002
Buenos Aires, Argentina
10101100110_{2} Posts 
You can change the worktodo.txt file in order to do that. My idea was to complete the 25digit level.

20110127, 17:36  #93  
Sep 2010
Annapolis, MD, USA
3^{3}·7 Posts 
Quote:
In an unrelated note, I've been doing a bunch of P1 in the M198xxxx range and found some factors, if I have a chance I'll post them later. I hope to finish them ASAP because I hadn't yet figured out how to reserve exponents, but I did ensure that they weren't already reserved at the time I selected this range. I saw some people doing ECM in the M196xxxx and I hope to finish off any remaining unreserved exponents before they reach me. Now that I know how, in the future, I will ensure that all exponents are properly reserved. But I think I will be done with the unreserved ones in the next 2448 hours, so I am not going to bother getting assignment IDs for them I suppose... I just reserved M1979xxx (about 30 exponents) and will probably keep working my way around the upper portions of the 1.9M range  as I mentioned, from now on, I will be reserving exponents in advance. 

20110128, 12:01  #94 
Aug 2002
Buenos Aires, Argentina
1382_{10} Posts 
Another result in this area (5 factors from 13 numbers = 38% efficiency):
M800971 has a factor: 289524442699835508796196072489 Last fiddled with by alpertron on 20110128 at 12:03 
20110128, 12:39  #95  
Apr 2010
Over the rainbow
2,659 Posts 
thanks to mfackt....
Quote:


20110128, 13:08  #96 
Jan 2011
Cincinnati, OH
2^{2}×5^{2} Posts 
TF 
M80076611 has a factor: 306028098438561259951 
20110130, 03:24  #97 
Sep 2010
Annapolis, MD, USA
3^{3}·7 Posts 
I just finished with the M198xxxx range. Most of them previously had P1 with B1=B2=40000, and I did them all to B1=1000000, B2=30000000... kinda arbitrarily selected bounds, but they were fairly successful. I found 19 factors in 215 tests (8.84% success rate), with eight factors in Stage 1 and eleven factors in Stage 2.
Code:
M1980023 has a factor: 13571695065543008351 (Stage 2) M1980247 has a factor: 1028007425734913593231 (Stage 2) M1980523 has a factor: 11068436810055540356047 (Stage 2) M1981409 has a factor: 437425184457765488071 (Stage 1) M1981493 has a factor: 98629747385844827351 (Stage 2) M1982989 has a factor: 6724437055332257192401 (Stage 1) M1983503 has a factor: 186794246935371583225132033 (Stage 2) M1983643 has a factor: 341312694343914135923033 (Stage 1) M1983913 has a factor: 31641965132080519849 (Stage 2) M1984069 has a factor: 1899812306079643525511 (Stage 2) M1985849 has a factor: 930999806671532321831 (Stage 2) M1985887 has a factor: 243125032539991259230127 (Stage 2) M1986199 has a factor: 2956613317747890929 (Stage 1) M1986337 has a factor: 31682922079570461988879 (Stage 1) M1987693 has a factor: 16044916528780756946806361 (Stage 1) M1988669 has a factor: 4129291590996270537719 (Stage 1) M1988887 has a factor: 5280340350328940238497 (Stage 1) M1989643 has a factor: 95213757966946302721 (Stage 2) M1989671 has a factor: 10604060702216236539257 (Stage 2) 
20110131, 19:45  #98 
"Nathan"
Jul 2008
Maryland, USA
5×223 Posts 
P1 stage 2
M60004691 has the stage 2 P1 (91.52bit, and prime) factor 3551945791320808519293061121.

20110131, 21:14  #99 
Dec 2007
Cleves, Germany
1022_{8} Posts 
P1 stage 1
M8338709 has a factor: 1011726731761493320698321583
90 bits. Prime. k=3^3*19*53*83*191*479*2269*129497. Stage 1. 
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