20180319, 17:01  #672 
Oct 2007
Manchester, UK
2514_{8} Posts 
My largest SNFS factorisation to date, c228 = p88 * p141

20180320, 05:03  #673  
Jan 2018
33_{10} Posts 
Quote:
How long did it take to complete that? 

20180320, 06:45  #674 
Oct 2007
Manchester, UK
2514_{8} Posts 
25 days on a 3.4 Ghz quad core. I think that's a pretty good time for a number with SNFS difficulty 234, those p^71 numbers have great degree 6 polynomials that sieve super well.

20180324, 07:37  #675 
Jan 2018
3×11 Posts 
I just found a P48 factor for (101691318335746946042200793713846391^71) so I think the C143 that's left should be easy enough to finish off.

20180401, 05:02  #676 
Jan 2018
21_{16} Posts 
I wanted to give everyone a monthly update on the ECM status of the composites in the t2100 file. I'm still running 35 digit ECM on the C130C199 composites and I should have that finished in a little over a week. After that I'm planning on running the following tasks:
C200  C299 at 30 digits: ~9000 composites C130  C139 at 40 digits: ~110 composites You can find my code and the snapshot of the t2100 file that I'm working with at https://gitlab.com/hyramgraff/oddperfectecm. Every time I update my snapshot of the t2100 file, I run the following tasks on the new composites: 25 digit ECM for all composites 30 digit ECM for C130  C199 
20180401, 17:30  #677 
Oct 2007
Manchester, UK
1356_{10} Posts 
For what it's worth, I've performed a lot of ECM on the c251 in 1631830528533060342008861^131. Unless I've been somewhat unlucky, I'm now fairly sure it has no factors less than 55 digits. I'm currently looking around the 65 digit level, and soon to be 70 digit level.

20180615, 14:00  #678 
Sep 2008
Kansas
2^{2}×7×11^{2} Posts 
OPN Most Wanted Road Blocks
Around 200 new composites have been added to the MWRB file between sizes C131C189. Many are of the SNFS flavor. Use your favorite tool to find the ones you might like or request a range and I can post some here.
I am reserving the following numbers (in no particular order): Code:
55667^371 509^731 14821^531 45427^371 33329911692062219289866143679653390355732583233312231696104296093313266337 ^31 (P74^31) 12948^111 383^731 
20180617, 03:24  #679 
Sep 2008
Kansas
6474_{8} Posts 
MWRB file
Taking next.
Code:
14755578513200128694405527268494894972322250111221828730338500819651^31 3870372610603^131 
20180617, 13:45  #680 
Sep 2008
Kansas
6474_{8} Posts 
MWRB
Taking all the remaining C13x in the MWRB file.

20180619, 13:36  #681 
Sep 2008
Kansas
110100111100_{2} Posts 
MWRB
Starting on the C14x's in the MWRB file. Not to worry, there are still about 140 composites in the range C150C189.

20180620, 05:53  #682  
Jan 2018
3·11 Posts 
Quote:
You can find my code and the snapshot of the t2100 file that I'm working with at https://gitlab.com/hyramgraff/oddperfectecm. Every time I update my snapshot of the t2100 file, I run the following tasks on the new composites: 25 digit ECM for all composites 30 digit ECM for C130  C399 (up from C199 in the last report) 35 digit ECM for C130  C199 (added since the last report) 40 digit ECM for C130  C149 (added since the last report) Mildly interesting factorization of the month: C139 = P41 * P44 * P55 (both factors found at B1 = 45 digits http://factordb.com/index.php?id=1100000000537424706) Question: What's a good upper limit for running ECM on smaller composites? 45 digits for n <= 139? 50 digits for C140 <= n <= C159? 55 digits for C160 <= n <= 179? 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Passive Pascal  Xyzzy  GPU Computing  1  20170517 20:22 
Tesla P100 — 5.4 DP TeraFLOPS — Pascal  Mark Rose  GPU Computing  52  20160702 12:11 
Nvidia Pascal, a third of DP  firejuggler  GPU Computing  12  20160223 06:55 
Calculating perfect numbers in Pascal  Elhueno  Homework Help  5  20080612 16:37 
Factorization attempt to a c163  a new Odd Perfect Number roadblock  jchein1  Factoring  30  20050530 14:43 