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-   -   a white swan (https://www.mersenneforum.org/showthread.php?t=13857)

fivemack 2010-09-07 10:05

a white swan
 
I ran 16 msieve jobs on a 16-thread E5520 machine overnight; will give them another night then start sieving this C154

[email]twomack@perutz:~/math/8352.1659.ps[/email]% grep orm */msieve.dat.p|sort -g -k7|tail -n2
05/msieve.dat.p:# norm 4.748431e-15 alpha -6.918931 e 2.738e-12 rroots 5
05/msieve.dat.p:# norm 6.124536e-15 alpha -7.187294 e 3.101e-12 rroots 5

That's an [b]enormous[/b] jump up

tgrdy 2010-09-07 11:21

I have sieved a C155 last month, pol51 got very good result on C155.

[CODE]name: c155
12199013741075092697277058272068699496175793947855350620131384560551132989998554364827157047947642499019264099857141857117583668732368414756143066697037831[/CODE]
skew: 1045136.28
# norm 2.27e+21
c5: 4603320
c4: -8643354678366
c3: -23229658654233831899
c2: 7591355774065335794017922
c1: 6896128775024703671131698569170
c0: -1654136390110887053567413679248552485
# alpha -6.93
Y1: 512796205383113353
Y0: -305246705185119988393049615458
# Murphy_E 3.24e-12

frmky 2010-09-07 17:32

While certainly not that large in magnitude, unexpected jumps don't seem all that rare. Here's a C182 I'm working on now:
[CODE]# norm 5.618647e-18 alpha -8.172357 e 4.750e-14 rroots 5
# norm 5.613703e-18 alpha -8.553629 e 4.756e-14 rroots 3
# norm 5.636766e-18 alpha -8.148423 e 4.758e-14 rroots 5
# norm 5.730154e-18 alpha -8.482738 e 4.765e-14 rroots 5
# norm 5.682034e-18 alpha -8.569509 e 4.789e-14 rroots 5
# norm 5.756226e-18 alpha -8.593399 e 4.824e-14 rroots 5
# norm 5.834923e-18 alpha -8.158231 e 4.850e-14 rroots 5
# norm 5.846501e-18 alpha -8.868956 e 4.895e-14 rroots 3
# norm 5.898164e-18 alpha -8.725650 e 4.906e-14 rroots 3
# norm 6.894168e-18 alpha -8.997724 e 5.401e-14 rroots 5
[/CODE]

A C157:
[CODE]# norm 2.179923e-15 alpha -7.156988 e 1.728e-12
# norm 2.313989e-15 alpha -6.976347 e 1.729e-12
# norm 2.205729e-15 alpha -6.626018 e 1.731e-12
# norm 2.242422e-15 alpha -6.720881 e 1.741e-12
# norm 2.220800e-15 alpha -7.052835 e 1.747e-12
# norm 2.299270e-15 alpha -7.915852 e 1.750e-12
# norm 2.254064e-15 alpha -6.800389 e 1.758e-12
# norm 2.284661e-15 alpha -8.443785 e 1.762e-12
# norm 2.366668e-15 alpha -7.679670 e 1.799e-12
# norm 2.901203e-15 alpha -7.808293 e 2.070e-12
[/CODE]

A C179:
[CODE]# norm 1.103652e-17 alpha -8.091368 e 7.138e-14 rroots 5
# norm 1.125230e-17 alpha -7.987391 e 7.174e-14 rroots 5
# norm 1.115240e-17 alpha -8.062913 e 7.190e-14 rroots 5
# norm 1.141907e-17 alpha -8.469814 e 7.352e-14 rroots 3
# norm 1.165094e-17 alpha -8.253197 e 7.388e-14 rroots 3
# norm 1.252224e-17 alpha -8.335315 e 7.438e-14 rroots 3
# norm 1.164100e-17 alpha -8.585526 e 7.442e-14 rroots 3
# norm 1.182218e-17 alpha -8.638512 e 7.515e-14 rroots 3
# norm 1.260895e-17 alpha -8.367998 e 7.684e-14 rroots 5
# norm 1.307908e-17 alpha -8.505804 e 7.968e-14 rroots 3
[/CODE]

wblipp 2010-09-07 21:22

[QUOTE=frmky;228863]... don't seem all that rare.[/QUOTE]

Isn't that what "white swan" means? Pretty although not all that rare.


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