20150601, 19:57  #947 
Sep 2002
Oeiras, Portugal
1441_{10} Posts 
Another one down:
UID: lycorn/asteroid, M27943 has a factor: 9595745432621621468883227471666940222487 (ECM curve 228, B1=3000000, B2=300000000), 132.818 bits k = 3 × 7 × 2029 × 20873 × 575231 × 47418037 × 7077886967119 Not too rough, not too smooth. Just fine... 
20150601, 23:21  #948 
Jan 2015
11·23 Posts 
I keep seeing this thread on my way into LMH>100M
http://www.mersenne.ca/exponent/78282691 127 bits, do i win a prize? 
20150601, 23:39  #949 
Apr 2010
Over the rainbow
2^{2}×17×37 Posts 
thats a really nice factor

20150604, 03:06  #950 
Aug 2002
Dawn of the Dead
5·47 Posts 
Nice find!
Are you going to do your others to B1=44000000? I did a test on my block, M25xxx, and got 27 curves per day. Quite an effort, to finish these 10 or so through to 17100 curves, several years or so ... I'll begin mass deployment in a few days time, is it better to do chunks of each on all cores or the full run on a single core? The latter will take over a year ... I hope they come up with better hardware real soon, and that I can be positioned to make advantage ... long stretch needless to say, but I am determined. Am I crazy enough to finish this, and embark on the next B1 ??? BTW Stage 2 only takes 750 MB. Last fiddled with by PageFault on 20150604 at 03:11 
20150604, 11:31  #951 
Aug 2002
Buenos Aires, Argentina
3^{2}×149 Posts 
Today my computer found a prime factor of the same size (133 bits):
[Thu Jun 04 02:54:08 2015] P1 found a factor in stage #2, B1=1000000, B2=30000000, E=12. M955363 has a factor: 7315800908340060929629104157850801671121 (P1, B1=1000000, B2=30000000, E=12) k = 2^3 × 5 × 173 × 3733 × 4111 × 100361 × 102563 × 298631 × 11729009 
20150604, 23:06  #952  
Sep 2002
Oeiras, Portugal
11·131 Posts 
Quote:
I will also pursue the quest for a factor of M1277, using Prime95 for Stage 1 and GMPECM for Stage 2. If you have a fair amount of memory available, you could also give it a go. As for how to split the tests among several cores, there´s not a lot to be gained in doing it one way or the other. If I were you, I would probably do a mix: e.g. test 2 exponents on 4 cores, assigning 2 chunks of the same test to each core. That´s what I´m currently doing... Last fiddled with by lycorn on 20150604 at 23:07 

20150605, 01:30  #953 
Apr 2010
Over the rainbow
2^{2}×17×37 Posts 
a nice one down pm1 find
M78235639 has a factor 8803993906198449472411631 (82.6 bit, ) found in stage 1 k=5 × 43 × 131 × 3643 × 5827 × 94109 Last fiddled with by firejuggler on 20150605 at 01:31 
20150606, 08:06  #954  
Serpentine Vermin Jar
Jul 2014
3283_{10} Posts 
Quote:
B1=5,000,000,000,000 B2=10,000,000,000,000 Methinks it'll finish in a couple more weeks or something. I was bored and thought it'd be fun to allocate a few spare cores to P1 work on smaller exponents, even though I know ECM would probably be more fruitful, or so I've heard. I'm also doing these to the same bounds: M1619 M1753 M2137 M2267 M2273 Each running on one core of a 6core Xeon (while the other chip in this dualCPU system is doing LL tests). I started the M1277 run a while back so it's further along. The other ones will be a month or so before finishing up. Those last two are only at 14% right now. Speaking of P1, is there any consensus out there about the fastest program for P1 work? Would gmpecm be something to look at for P1 as well as ECM, or maybe something else (Windows based)? 

20150606, 10:54  #955  
Sep 2010
Scandinavia
1147_{8} Posts 
Quote:
Yes, ECM is more efficient. For large enough numbers Prime95 is faster in stage1. GMPECM is faster in stage2, depending on bounds and input size. So in short; it depends. But GMPECM can be way faster in stage2. 

20150607, 16:13  #956 
Romulan Interpreter
Jun 2011
Thailand
13·19·37 Posts 
For how much ECM was done on these thingies, there is a very slim chance that P1 finds a factor.

20150607, 19:46  #957 
Sep 2002
Oeiras, Portugal
11×131 Posts 
Yeah, Prime95+GMPECM would really be the best bet for the lowest exponents in Primenet ranges, specially for machines with large amounts of memory.
Last fiddled with by lycorn on 20150607 at 19:46 
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