NFS results and reservations - Page 18

swellman · 2015-06-21, 21:24

Quote:

Originally Posted by XYYXF

That C166 is a factor of
(2^130)^6 + 1369*(37^21)^6
which has 235 decimal digits. Would SNFS be faster here?

Not sure - Ryan does his own thing. Maybe test sieving indicated a (quickly found?) GNFS poly was faster than SNFS? But I'm just speculating.

XYYXF · 2015-06-21, 21:41

Please check whether the pages are updated correctly:
http://www.primefan.ru/xyyxf/results.html#0
http://www.primefan.ru/xyyxf/status.html#0

XYYXF · 2015-06-21, 22:58

Quote:

Originally Posted by swellman

Ryan is reserving this monster.

C282_140_137 has SNFS difficulty close to 300 and quite large coefficients. A lot of ECM is needed before sieving.

Why that one? I'd choose something like C292_139_132 instead.

BTW, C300_141_133 survived a lot of ECM and has a pretty septic: 133*(133²⁰)⁷ + (141¹⁹)⁷ = 2 * C300

swellman · 2015-06-21, 23:52

Ryan did run a lot of ECM prior to starting to sieve this number.

I'll notify him about this thread, in case he wishes to discuss his reasons for choosing to joust with this particular dragon.

fivemack · 2015-06-22, 13:07

I clearly forgot to post the reservation of C182_147_125 for NFS@home

I think yoyo@home has run a t60 on that number; polynomial selection is underway, but it'll probably be two to three months before the number gets to the top of the list and gets sieved.

swellman · 2015-06-25, 21:45

Please reserve the following for Ryan for SNFS:

C166_117_76
C171_144_82
C195_143_37
C184_148_72

Thanks.

swellman · 2015-06-26, 14:18

Quote:

Originally Posted by XYYXF

BTW, C300_141_133 survived a lot of ECM and has a pretty septic: 133*(133²⁰)⁷ + (141¹⁹)⁷ = 2 * C300

At last word, Ryan was attempting this septic. Sieving appeared to flow quite nicely - very pretty indeed!

Sean

YuL · 2015-06-28, 19:23

There it is

Code:

Sun Jun 28 21:14:02 2015  p70 factor: 2378759421996521105814750742813337130470020896264595220008366847939803
Sun Jun 28 21:14:02 2015  p158 factor: 13686713872629748020403921617178344546702811907203428595556985297479108403356012543024284513635728293879307324254663526751320492556033869687513253869765393399

118^117+117^118 = 0 mod 2378759421996521105814750742813337130470020896264595220008366847939803

27319 thread.hour of sieving using 15e siever. LA on 10.26M matrix took 68h on Core i7-5820K (6 threads). Total time = 42 wall clock days.

Log is here.

fivemack · 2015-06-30, 06:15

Code:

Tue Jun 30 02:43:05 2015  prp77 factor: 23980713798968383803571335940889143138606109786090333430303664703080277281913
Tue Jun 30 02:43:05 2015  prp85 factor: 6649550578449313690382221286208947073152160730919647987925979453397824148114239571237

GNFS; 3400 CPU-hours on about 30 cores Opteron/1900MHz to sieve; 32 real-time-hours on 8 cores of Xeon D-1540 for 9.6M matrix

fivemack · 2015-06-30, 08:48

Code:

p85 6050340997978855776830456485170051559306348315048147242788872688537724485354895001721
p123 181433896824242847049425963477384781006599048916436514281579150694966931249009342243828741296514349301443233963374884562341

About a week sieving on 16 threads Xeon E5-2650v2, about 12 hours linear algebra -t8 on same machine

amphoria · 2015-06-30, 11:53

Quote:

Originally Posted by amphoria

Reserving C227_118_85 for factoring by SNFS.

Code:

Tue Jun 30 08:59:58 2015  p68 factor: 22980612148949206622244510817222401480605307840245438579471719969939
Tue Jun 30 08:59:58 2015  p160 factor: 2917249682125896138858794146011607892742839635048080186665800208097427848309776535413806990263135915468319613806484991328349249210586820281919456767320306073941

2015-06-25, 21:45	#193
swellman Jun 2012 6023₈ Posts	Reservations Please reserve the following for Ryan for SNFS: C166_117_76 C171_144_82 C195_143_37 C184_148_72 Thanks.

2015-06-28, 19:23	#195
YuL Feb 2012 Paris, France 7·23 Posts	C227_118_117 There it is Code: Sun Jun 28 21:14:02 2015 p70 factor: 2378759421996521105814750742813337130470020896264595220008366847939803 Sun Jun 28 21:14:02 2015 p158 factor: 13686713872629748020403921617178344546702811907203428595556985297479108403356012543024284513635728293879307324254663526751320492556033869687513253869765393399 118^117+117^118 = 0 mod 2378759421996521105814750742813337130470020896264595220008366847939803 27319 thread.hour of sieving using 15e siever. LA on 10.26M matrix took 68h on Core i7-5820K (6 threads). Total time = 42 wall clock days. Log is here. Last fiddled with by YuL on 2015-06-28 at 19:30 Reason: Duration of sieving + LA

2015-06-30, 08:48	#197
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 6424₁₀ Posts	C208_133_43 done Code: p85 6050340997978855776830456485170051559306348315048147242788872688537724485354895001721 p123 181433896824242847049425963477384781006599048916436514281579150694966931249009342243828741296514349301443233963374884562341 About a week sieving on 16 threads Xeon E5-2650v2, about 12 hours linear algebra -t8 on same machine

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2015-06-21, 21:41	#189
XYYXF Jan 2005 Minsk, Belarus 400₁₀ Posts	Please check whether the pages are updated correctly: http://www.primefan.ru/xyyxf/results.html#0 http://www.primefan.ru/xyyxf/status.html#0

2015-06-21, 23:52	#191
swellman Jun 2012 11×281 Posts	Ryan did run a lot of ECM prior to starting to sieve this number. I'll notify him about this thread, in case he wishes to discuss his reasons for choosing to joust with this particular dragon.

2015-06-22, 13:07	#192
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 2³×11×73 Posts	I clearly forgot to post the reservation of C182_147_125 for NFS@home I think yoyo@home has run a t60 on that number; polynomial selection is underway, but it'll probably be two to three months before the number gets to the top of the list and gets sieved.