[QUOTE=XYYXF;404520]That C166 is a factor of
(2^130)^6 + 1369*(37^21)^6
which has 235 decimal digits. Would SNFS be faster here?[/QUOTE]

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.

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

[QUOTE=swellman;403987]Ryan is reserving this monster.[/QUOTE]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*(133[sup]20[/sup])[sup]7[/sup] + (141[sup]19[/sup])[sup]7[/sup] = 2 * C300

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.

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.

Reservations
 

Please reserve the following for Ryan for SNFS:

C166_117_76
C171_144_82
C195_143_37
C184_148_72

Thanks.

[QUOTE=XYYXF;404533]

BTW, C300_141_133 survived a lot of ECM and has a pretty septic: 133*(133[sup]20[/sup])[sup]7[/sup] + (141[sup]19[/sup])[sup]7[/sup] = 2 * C300[/QUOTE]

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

Sean

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
[/CODE]

[URL="http://factordb.com/index.php?id=1000000000044736142"]118^117+117^118[/URL] = 0 mod [URL="http://factordb.com/index.php?id=1100000000787961355"]2378759421996521105814750742813337130470020896264595220008366847939803[/URL]

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 [URL="http://pastebin.com/q1gRf3zj"]here[/URL].

C162_123_58 done
 

[code]
Tue Jun 30 02:43:05 2015 prp77 factor: 23980713798968383803571335940889143138606109786090333430303664703080277281913
Tue Jun 30 02:43:05 2015 prp85 factor: 6649550578449313690382221286208947073152160730919647987925979453397824148114239571237
[/code]

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

C208_133_43 done
 

[code]
p85 6050340997978855776830456485170051559306348315048147242788872688537724485354895001721
p123 181433896824242847049425963477384781006599048916436514281579150694966931249009342243828741296514349301443233963374884562341
[/code]

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

[QUOTE=amphoria;404237]Reserving C227_118_85 for factoring by SNFS.[/QUOTE]

[CODE]Tue Jun 30 08:59:58 2015 p68 factor: 22980612148949206622244510817222401480605307840245438579471719969939
Tue Jun 30 08:59:58 2015 p160 factor: 2917249682125896138858794146011607892742839635048080186665800208097427848309776535413806990263135915468319613806484991328349249210586820281919456767320306073941
[/CODE]