GNFS targets which need more ECM - Page 20

Max0526 · 2017-01-25, 20:59

@XYYXF
I took it. Will post a (good) poly here just in case.

fivemack · 2017-01-26, 09:00

I did quite a lot of trial sieving on C187_142_67 overnight; Max0526's improved version of my 2.967e-14 polynomial scored best on speed and joint best on yield, so I've queued that up at nfs@home. It will be a month or so before it gets to the front of the queue.

VBCurtis · 2017-01-27, 03:30

Quote:

Originally Posted by fivemack

I did quite a lot of trial sieving on C187_142_67 overnight; Max0526's improved version of my 2.967e-14 polynomial scored best on speed and joint best on yield, so I've queued that up at nfs@home. It will be a month or so before it gets to the front of the queue.

I ended my search last night; my last run produced two new polys that you may wish to review (perhaps after Max has a go at CADO-polishing):

Code:

# norm 3.363698e-18 alpha -7.872614 e 3.255e-14 rroots 3
skew: 101290985.31
c0: -231288706717218554006053122749386079338896300
c1: -50729059646400046429743582804542451330
c2: 5221628579130998207619594476023
c3: -5151532303449624133886
c4: -96695694433892
c5: 789360
Y0: -1552897903695888361373339935019695423
Y1: 414251140931205179

Code:

# norm 3.182783e-18 alpha -8.051037 e 3.141e-14 rroots 3
skew: 156479193.49
c0: -36427416491556217798309698863750215776455669000
c1: -261685774848486992328802218579922600770
c2: 5236100365564333680781850953843
c3: 5717117859088839704034
c4: -175494306325892
c5: 789360
Y0: -1552897903704158964109748223347414433
Y1: 414251140931205179

Max0526 · 2017-01-27, 14:57

@XYYXF
http://factordb.com/index.php?id=1100000000896807380

Max0526 · 2017-01-27, 16:51

@VBCurtis
CADO's pick (same E):

Code:

Y0: -1552897903690140510802600002423620303
Y1: 414251140931205179
c0: -39260282190539411368274355040922664104516650200
c1: 90311756211311623500614586152054319450
c2: 4916580919503810252800881664983
c3: -8998548972317537852926
c4: -41932739329892
c5: 789360
skew: 160993750.28459
# alpha -8.05, 3 real roots
# MurphyE=3.13427447e-14

swellman · 2017-01-31, 19:01

Reserving C195_130_121 for ECM (25k curves @B1=3e8).

fivemack · 2017-02-01, 18:27

Running 25600@3e8 on C195_148_83

fivemack · 2017-02-20, 07:58

25600 curves at stage 1 completed on C195_148_83

3840 stage-2 completed, the rest all queued up on fairly slow hardware, ETA roughly Saturday 25th

fivemack · 2017-02-25, 18:40

25600 curves completed on C195_148_83, no factor found

swellman · 2017-02-25, 19:31

Quote:

Originally Posted by fivemack

25600 curves completed on C195_148_83, no factor found

Nice work on the ECM. Any interest in a poly search for C194_144_91 or C195_148_83? Or perhaps a quick search could be run to verify if GNFS is really preferable to SNFS for these composites?

On a related note - I finally got some gpu code installed with all the trimmings only to find the compute capability of my old video card is too low. After a suitable amount of cursing, it was determined that it's time for an upgrade. So I should shortly be able to help with more of the heavy lifting on big ECM and GNFS poly searches.

fivemack · 2017-02-25, 21:21

The 1080 is running ECM for C278_135_128 at the moment (http://mersenneforum.org/showpost.ph...6&postcount=42) which should complete in five to six days, and then I will try some polynomial selection.

2017-01-25, 20:59	#210
Max0526 "Max" Jun 2016 Toronto 19·47 Posts	C141_145_59 pick up @XYYXF I took it. Will post a (good) poly here just in case.

2017-01-27, 14:57	#213
Max0526 "Max" Jun 2016 Toronto 19·47 Posts	C141_145_59 is factored @XYYXF http://factordb.com/index.php?id=1100000000896807380

2017-01-31, 19:01	#215
swellman Jun 2012 2²×13×59 Posts	C195_130_121 Reserving C195_130_121 for ECM (25k curves @B1=3e8).

2017-02-20, 07:58	#217
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 7²·131 Posts	25600 curves at stage 1 completed on C195_148_83 3840 stage-2 completed, the rest all queued up on fairly slow hardware, ETA roughly Saturday 25th Last fiddled with by fivemack on 2017-02-21 at 08:25

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2017-01-26, 09:00	#211
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 1913₁₆ Posts	I did quite a lot of trial sieving on C187_142_67 overnight; Max0526's improved version of my 2.967e-14 polynomial scored best on speed and joint best on yield, so I've queued that up at nfs@home. It will be a month or so before it gets to the front of the queue.

2017-02-01, 18:27	#216
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 1913₁₆ Posts	Running 25600@3e8 on C195_148_83

2017-02-25, 18:40	#218
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 14423₈ Posts	25600 curves completed on C195_148_83, no factor found

2017-02-25, 21:21	#220
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 7²×131 Posts	The 1080 is running ECM for C278_135_128 at the moment (http://mersenneforum.org/showpost.ph...6&postcount=42) which should complete in five to six days, and then I will try some polynomial selection.