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2022-10-06, 13:24   #2267
EdH

"Ed Hall"
Dec 2009

526110 Posts

Quote:
 Originally Posted by swellman . . .Not sure if it will spin? Still searching…
It didn't improve the score, but the skew is less (but cownoise gave it the larger value):
Code:
Y0: -3160720488954169809647881433776110225
Y1: 206652138316664557
c0: 502377242796846051412861486158312581951013472
c1: -202109221072104758561637579422432635540
c2: 804672126780554744203995454436
c3: 733179562200055375364395
c4: 411226933575522
c5: -15611400
skew: 29761061.935
# lognorm 60.72, E 52.85, alpha -7.86 (proj -2.44), 5 real roots
# MurphyE(Bf=1.000e+07,Bg=5.000e+06,area=1.000e+16)=1.872e-14

Best poly cownoise values: 54331349.26224      1.89513471e-14

 2022-10-07, 02:13 #2268 firejuggler     "Vincent" Apr 2010 Over the rainbow B4416 Posts All I have is Code: Y0: -2349538120268076325451367548588041732 Y1: 216999369325580979475103209 c0: -206293291655300238669449774628062216958763830 c1: 82369996118667102223138428044151970345 c2: 10783262440833015945159774434694 c3: -1204927366434583621967761 c4: -35714675681032968 c5: -409368960 skew: 12071245.022 # lognorm 61.08, E 52.43, alpha -8.66 (proj -2.57), 3 real roots # MurphyE(Bf=1.000e+07,Bg=5.000e+06,area=1.000e+16)=1.828e-14 Best poly cownoise values: 17364442.08261 1.84142550e-14
 2022-10-07, 07:37 #2269 Gimarel   Apr 2010 2·53 Posts C203_147_104 It took a while but now I have an exceptional poly: Code: # norm 1.034751e-19 alpha -7.865818 e 3.781e-15 rroots 5 skew: 114689002.27 c0: -136094338718696528763861227757666209052860504340 c1: 2585516710844056145050697469557179455871 c2: 248902306961428891522709892931234 c3: 1363500587643959285662657 c4: -20640309950741262 c5: 21621600 Y0: -1497348835519820920956356551277843806694 Y1: 90107121175535206837057
2022-10-07, 10:24   #2270
swellman

Jun 2012

2×52×7×11 Posts

Quote:
 Originally Posted by Gimarel It took a while but now I have an exceptional poly: Code: # norm 1.034751e-19 alpha -7.865818 e 3.781e-15 rroots 5 skew: 114689002.27 c0: -136094338718696528763861227757666209052860504340 c1: 2585516710844056145050697469557179455871 c2: 248902306961428891522709892931234 c3: 1363500587643959285662657 c4: -20640309950741262 c5: 21621600 Y0: -1497348835519820920956356551277843806694 Y1: 90107121175535206837057
A great find! Beats your previous record for a c203.

Thanks to all who searched.

 2022-10-07, 12:14 #2271 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 5,261 Posts Nice Gimarel! And, in all my efforts I haven't as yet found (or spun) a 2-handle! (I know, I haven't modified Mseive. . .)
 2022-10-07, 15:01 #2272 swellman     Jun 2012 2×52×7×11 Posts Meanwhile in the C190 poly search requested by @unconnected in post 2253 above: I found nothing better. Can’t seem to break the 2 barrier! Afraid my search for a quality polynomial is in vain.
 2022-10-09, 18:00 #2273 unconnected     May 2009 Moscow, Russia 24×181 Posts Thank you guys for your work, I'll test-sieve top polys and send the best one to the 15e queue.
 2022-10-10, 19:55 #2274 wombatman I moo ablest echo power!     May 2013 22×463 Posts If anyone is willing, I have a C208 that has blocked progression of Home Primes Base 2 (4496) for at least 3 years now. I previously did some poly searching for degree 5 and 6 (and even some test sieving, as I recall), but this number would likely benefit from the collective skills here. I will try and dig up that previous work in the mean time, but I would appreciate any attempts to find good polys for: Code: 8095101662371927421703337019465587498085337648622133688278589711654019359923503887978141510461468343349838217540569173400647791769725685803537804186347867144149599002247585690859122186539724272741806859085719
 2022-10-10, 20:22 #2275 firejuggler     "Vincent" Apr 2010 Over the rainbow 22·7·103 Posts I will try something with cado-nfs
 2022-10-10, 20:35 #2276 swellman     Jun 2012 74128 Posts C208 I’m willing to help. I believe a deg 5 still works best on a C208 but others will likely have deeper insights. We could search for both a deg 5 and 6, with subsequent test sieving deciding the issue. From the GNFS record table, escore > 1.3e-15 looks great for deg 5, and > 1.6e-15 for deg 6. Regardless, starting deg 5 search with a5 < 1M using msieve-GPU.
2022-10-10, 20:37   #2277
wombatman
I moo ablest echo power!

May 2013

22×463 Posts

Quote:
 Originally Posted by firejuggler I will try something with cado-nfs
Quote:
 Originally Posted by swellman I’m willing to help. I believe a deg 5 still works best on a C208 but others will likely have deeper insights. We could search for both a deg 5 and 6, with subsequent test sieving deciding the issue. From the GNFS record table, escore > 1.3e-15 looks great for deg 5, and > 1.6e-15 for deg 6. Regardless, starting deg 5 search with a5 < 1M using msieve-GPU.
Thanks to the both of you!

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