20171218, 12:18  #430  
Oct 2009
Korea
2^{2} Posts 
A bit nice ECM hit
62 digits factor with B1=11M
Quote:


20171218, 12:22  #431 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3·29·83 Posts 
Wow, that's a pretty incredible find right there. Nice going

20171218, 12:40  #432  
Mar 2015
Australia
2·41 Posts 
Quote:
Andrew 

20171218, 20:19  #433  
Aug 2004
New Zealand
3^{2}×5^{2} Posts 
Quote:
You're likely to be somewhat underwhelmed by the progress in the last 10 years. I think back then there were a few outstanding in the n=100 to 110 range, we've moved as far as the 130s. Some of the more recent factorizations have been completed by Womack, others at NFS@Home, and myself. Paul (xilman) is active in this community, but I don't think he works or maintains up to date lists on these numbers. Here's what I have as current status: Code:
Smallest composites: : 167!1 C181, 145!1 C185, 176!1 C205, 136!1 C214, 179!1 C220 +: 169!+1 C193, 139!+1 C202, 165!+1 C202, 172!+1 C205, 150!+1 C213 First holes: : 136!1 C214, 139!1 C222, 141!1 C235, 142!1 C232, 145!1 C185 +: 139!+1 C202, 140!+1 C242, 146!+1 C223, 148!+1 C239, 150!+1 C213 

20180107, 15:00  #434 
(loop (#_fork))
Feb 2006
Cambridge, England
2^{2}×3^{2}×179 Posts 
139!+1 is sieving now, about 1% progress on the sieving per day so I expect to have some factors by the middle of Spring.

20180210, 12:56  #435 
Sep 2010
Scandinavia
1147_{8} Posts 
This was moderately surprising;
Code:
GMPECM 7.0.4dev [configured with GMP 6.1.1, enableasmredc] [ECM] Input number is (3761^1971)/((37611)) (701 digits) Using B1=4561, B2=5900000, polynomial x^1, sigma=2:5488031021996423492 Step 1 took 234ms Step 2 took 531ms ********** Factor found in step 2: 562895925799601989596986963845579 Found prime factor of 33 digits: 562895925799601989596986963845579 Composite cofactor ((3761^1971)/((37611)))/562895925799601989596986963845579 has 669 digits 
20180218, 11:27  #436 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
16065_{8} Posts 
Just saw this nice aliquot GNFS split, where the factors are within a factorof5 of each other
Code:
P53 = 14217452470664756386193874192650652909587358452024711 P53 = 68258578113070612746045366396559681840264538845755689 
20180316, 22:26  #437 
May 2009
Russia, Moscow
5171_{8} Posts 
From 355950:i3100:
Code:
GMPECM 6.4.3 [configured with GMP 5.0.5, enableasmredc] [ECM] Input number is 411957627119775385989446575095474922185011137757112191784280518543958234873694230248024231153654496440498346403470812602522290113950341 (135 digits) Using B1=1000000, B2=1045563762, polynomial Dickson(6), sigma=559213464 Step 1 took 3503ms Step 2 took 2204ms ********** Factor found in step 2: 10569114423707394666840460729453391212643716992655339366569371941409 Found composite factor of 68 digits: 10569114423707394666840460729453391212643716992655339366569371941409 Probable prime cofactor 38977497130291302211279801679050238712241241117209766296388154315749 has 68 digits 
20180429, 08:15  #438 
May 2013
Germany
3×29 Posts 
c279 = p126 * p153
Code:
c279 = (10^27931)/3 p126 = 683879988020855531843693974570809301443699094596561661475690616530795260027595121999433189270322605879651156172622984209245483 p153 = 487414954629682825615832070972614806528916687946252096353904135012248024359341728973161931019907828745530880376748837466333831896764672674769452527632481 
20180429, 14:36  #439 
May 2009
Russia, Moscow
7·383 Posts 
Alfred, congratulations for two new records for nearrepdigit project  for largest snfs factorization and biggest factor!
What hardware were used for sieving and LA and how many cpudays are spent? 
20180429, 20:16  #440 
May 2013
Germany
87_{10} Posts 
Thank you.
My hardware was a 32core Xeon E5 v2 @ 3.4 GHz and a mix with the equivalent of 64 cores @ 2.8 GHz. Collecting ~520e6 unique relations took about 520e6 sec (taking into account the duplicates), ~ 6000 cpudays, This is a roughly estimation, not an accurate measuring. LA was done with the real existing 32core Xeon and took nearly 500hrs. timestamps in the logfile do not reflect my breaks in the LA phase. 
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