mersenneforum.org fond of a factor? Bury yourself to become remains
 Register FAQ Search Today's Posts Mark Forums Read

 2011-01-27, 14:41 #89 markr     "Mark" Feb 2003 Sydney 10758 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 P-1 stage #2, B1=105000, B2=2283750, E=6. I keep thinking I should reduce the bounds...
 2011-01-27, 16:53 #90 alpertron     Aug 2002 Buenos Aires, Argentina 3·463 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
2011-01-27, 17:09   #91
KingKurly

Sep 2010
Annapolis, MD, USA

2758 Posts

Quote:
 Originally Posted by alpertron 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
How'd you settle on 220 as the number of ECM curves to run? (Just curious) Normally I see 1, 3, and 150.

 2011-01-27, 17:17 #92 alpertron     Aug 2002 Buenos Aires, Argentina 3·463 Posts You can change the worktodo.txt file in order to do that. My idea was to complete the 25-digit level.
2011-01-27, 17:36   #93
KingKurly

Sep 2010
Annapolis, MD, USA

33·7 Posts

Quote:
 Originally Posted by alpertron You can change the worktodo.txt file in order to do that. My idea was to complete the 25-digit level.
Ah, okay. I knew how to do it, I just wasn't sure why you had chosen 220, now I understand, thank you.

In an unrelated note, I've been doing a bunch of P-1 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 24-48 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.

 2011-01-28, 12:01 #94 alpertron     Aug 2002 Buenos Aires, Argentina 3·463 Posts Another result in this area (5 factors from 13 numbers = 38% efficiency): M800971 has a factor: 289524442699835508796196072489 Last fiddled with by alpertron on 2011-01-28 at 12:03
2011-01-28, 12:39   #95
firejuggler

"Vincent"
Apr 2010
Over the rainbow

51748 Posts

thanks to mfackt....

Quote:
 M80622803 has a factor 156127704855377865257 M80547619 has a factor 164225854090231111921 M80623813 has a factor 74358285257003853433 M80465149 has a factor 205346902306982285351 M80645441 has a factor 74037992691676741151 M80429911 has a factor 33776959888323700737 M80625551 has a factor 110687074647006079529 M80589031 has a factor 46693727088018753713 M79154843 has a factor 68788380075731936863 M80701741 has a factor 57218973166606961263 M80309303 has a factor 118578090508483702721 M80696089 has a factor 66027939754284563593 M80699447 has a factor 47032613446676890273 M80630159 has a factor 5856285027082755031 M80700929 has a factor 44381842139698978511 M80701553 has a factor 45527575148762247041 M80624041 has a factor 37515177594283365607 M80581283 has a factor 70717839619935960241 M80701561 has a factor 55672736219070980281 M80650799 has a factor 51454583621456883601 M77224867 has a factor 39977700267067630681
in the last few days, all by TF

 2011-01-28, 13:08 #96 drh     Jan 2011 Cincinnati, OH 22×52 Posts TF - M80076611 has a factor: 306028098438561259951
 2011-01-30, 03:24 #97 KingKurly     Sep 2010 Annapolis, MD, USA BD16 Posts I just finished with the M198xxxx range. Most of them previously had P-1 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)
 2011-01-31, 19:45 #98 NBtarheel_33     "Nathan" Jul 2008 Maryland, USA 21338 Posts P-1 stage 2 M60004691 has the stage 2 P-1 (91.52-bit, and prime) factor 3551945791320808519293061121.
 2011-01-31, 21:14 #99 ckdo     Dec 2007 Cleves, Germany 2·5·53 Posts P-1 stage 1 M8338709 has a factor: 1011726731761493320698321583 90 bits. Prime. k=3^3*19*53*83*191*479*2269*129497. Stage 1.

 Similar Threads Thread Thread Starter Forum Replies Last Post petrw1 PrimeNet 31 2015-03-24 16:49 VictordeHolland Lone Mersenne Hunters 4 2015-03-07 09:29 rogue Lounge 10 2008-11-21 05:25 fivemack ElevenSmooth 4 2008-05-07 19:28 dsouza123 Software 12 2003-08-21 18:38

All times are UTC. The time now is 06:47.

Mon Dec 6 06:47:49 UTC 2021 up 136 days, 1:16, 0 users, load averages: 1.38, 1.49, 1.51