20050118, 14:19  #1 
Aug 2002
Termonfeckin, IE
2768_{10} Posts 
7 table
Code:
Size Base Index Mod Diff Ratio 320 7 379  320.2 1 274 7 383  323.6 0.846 299 7 389  328.7 0.909 220 7 395  267.0 0.823 /5q 214 7 419  354 0.60 /gnfs 305 7 421  355.7 0.855 221 7 425  287.3 0.767 /5q 315 7 431  364.2 0.863 342 7 433  365.9 0.933 341 7 439  370.9 0.917 Last fiddled with by Batalov on 20210331 at 08:24 Reason: 7,443 is done (ecm) 
20051014, 09:05  #2 
Mar 2003
New Zealand
13×89 Posts 
Code:
7,259 C175 = P69 * P106 P69 = 357708888729481429441295130414301389734167320382217282028474835603757 P106 = 4105565335483009892405469384537186162336640263688626513538197586407434630567675699756450562264314334763133 
20051108, 09:18  #3 
"Nancy"
Aug 2002
Alexandria
9A3_{16} Posts 
2300 curves at B1=11M on 7,263 7,281 7,387 7,361 7,373 7,389 7,391. Adds 0.50108 to p45 and 0.06662 to p50 for each.
Alex Last fiddled with by akruppa on 20051109 at 19:54 
20051130, 20:55  #4 
"Nancy"
Aug 2002
Alexandria
2,467 Posts 
8394 curves at B1=44M on 7,379 c320. Adds 6.47185 to p45, 1.09425 to p50 and 0.16726 to p55.
Alex 
20051201, 13:30  #5  
"Bob Silverman"
Nov 2003
North of Boston
1110100110011_{2} Posts 
Quote:
Hi, What criteria do you use to select your ECM candidates? 

20051201, 15:29  #6 
"Nancy"
Aug 2002
Alexandria
2,467 Posts 
Mostly base 3, where 3,487 just started the matrix job. I'll do others soon. Besides base 3, p,q with p,q prime and no/few known primitive factors are high on my list, too. Currently ECM is running on 11,239 c246.
Alex Last fiddled with by akruppa on 20051201 at 16:24 Reason: typo 
20070517, 23:56  #7  
Jun 2005
lehigh.edu
400_{16} Posts 
263 = 50 + 213, completes 7, 347
Quote:
nearing halfway through the last run on the last large incomplete range for testing to p50, 2100 curves/7830 left to go on the generic c251c299 list (not 2 or 2+ with n < 1200). The only other, smaller range left having been updated on the 2 discussion thread. I'm assuming this one's complete, but Paul notes that he has the 213digit cofactor listed as "prp213", with the comment Quote:


20070718, 10:05  #8 
(loop (#_fork))
Feb 2006
Cambridge, England
1100100110110_{2} Posts 
New 7repunit pseudoprime
(7^352011)/6 is a base3 pseudoprime.
At 29749 digits it's much too big for ECPP (20562 digits took six K8/2400years, 15071 digits took two Xeon/2600years); 35200 looks splendidly composite, so I suppose I should start hunting cyclotomic factors. 
20070718, 12:00  #9 
Jun 2005
lehigh.edu
2^{10} Posts 

20070718, 13:20  #10  
"Bob Silverman"
Nov 2003
North of Boston
5^{2}·13·23 Posts 
Quote:
APRCL. 

20070813, 13:20  #11  
Jun 2005
lehigh.edu
1024_{10} Posts 
Quote:
p51 = 399676211948778347375576150888294069325575626336229 The 3rd cure2 duo factor (from the B1 = 260M run; on the part of c190c209 above difficulty 250). PaulZ's c120355 file lists this as entering ecmnet files as a c249, with what looks like a p47 found by Philip McLaughlin 20.02.05. Bruce 

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