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2021-10-15, 17:03   #3136
ryanp

Jun 2012
Boulder, CO

23×43 Posts

Quote:
 Originally Posted by EdH t50 completed on c187. Returning it to the Team. . .
Got a nice ECM hit:

Code:
GMP-ECM 7.0.5-dev [configured with GMP 6.2.0, GWNUM 30.4, --enable-asm-redc, --enable-assert] [ECM]
Due to incompatible licenses, this binary file must not be distributed.
Input number is 4276613063712577368288081530739263591499089531813322097225127270222273056912626535597839021815912255438970339609557004085494461513626726552563672414910189269704371033032701991682419832147 (187 digits)
Using B1=850000000, B2=15892628251516, polynomial Dickson(30), sigma=1:3081933653
Step 1 took 2094947ms
Step 2 took 503428ms
********** Factor found in step 2: 170637095614559495626472650841173273394976891446968003800528921837984319
Found prime factor of 72 digits: 170637095614559495626472650841173273394976891446968003800528921837984319
Prime cofactor 25062622217696010935394754634200029729816076320687547031252020375807414664369152943984086331891536127598793264044013 has 116 digits

Last fiddled with by ryanp on 2021-10-15 at 17:25

 2021-10-16, 10:13 #3137 SethTro     "Seth" Apr 2019 19916 Posts p72 is a nice factor Ryan! I finished a t45 on the c158, I'm running t50 now, and will factor it with CADO overnight if I don't find a factor.
 2021-10-20, 19:47 #3138 ryanp     Jun 2012 Boulder, CO 23·43 Posts I've hit the c186 blocker @i12601 with a fair bit of ECM, but it didn't crack. Running GNFS on it now.
 2021-10-21, 22:20 #3139 SethTro     "Seth" Apr 2019 6318 Posts I'm now the second person to know that the C158 factors as 235135428415733585976439325229520790520225044469128317898640986440315363425440537 *193342839483052979098666287649581036752342433417784528705948363890824381981587 CADO log from the job https://pastebin.com/3XKCNAxr
 2021-10-22, 01:45 #3140 ryanp     Jun 2012 Boulder, CO 23×43 Posts On the current blocker: Code: Fri Oct 22 00:23:35 2021 Msieve v. 1.54 (SVN Unversioned directory) Fri Oct 22 00:23:35 2021 random seeds: 5cea0abd 0b0b70d1 Fri Oct 22 00:23:35 2021 factoring 555958432502795536088243164830775698917032751414518213911278171078047388114270579974159891342877028645125852716894998202908925879207990171621524796676210279452917835825942186976047219757 (186 digits) Fri Oct 22 00:23:36 2021 no P-1/P+1/ECM available, skipping Fri Oct 22 00:23:36 2021 commencing number field sieve (186-digit input) Fri Oct 22 00:23:36 2021 R0: -945617671864395719846538528725581745 Fri Oct 22 00:23:36 2021 R1: 929931709079663768101 Fri Oct 22 00:23:36 2021 A0: -8772287074681587792891229961468094852568656 Fri Oct 22 00:23:36 2021 A1: 323562416604841464967297736760232146 Fri Oct 22 00:23:36 2021 A2: 277422772718715127786474098251 Fri Oct 22 00:23:36 2021 A3: -901626220424877727177 Fri Oct 22 00:23:36 2021 A4: -492746228506694 Fri Oct 22 00:23:36 2021 A5: 1470600 Fri Oct 22 00:23:36 2021 skew 1.00, size 3.410e-18, alpha -6.359, combined = 1.531e-16 rroots = 5 Fri Oct 22 00:23:36 2021 Fri Oct 22 00:23:36 2021 commencing linear algebra Fri Oct 22 00:23:36 2021 using VBITS=128 Fri Oct 22 00:23:40 2021 read 30734747 cycles Fri Oct 22 00:25:04 2021 cycles contain 103545122 unique relations Fri Oct 22 00:31:43 2021 read 103545122 relations Fri Oct 22 00:35:03 2021 using 20 quadratic characters above 4294917295 Fri Oct 22 00:44:20 2021 building initial matrix Fri Oct 22 01:10:22 2021 memory use: 14734.4 MB Fri Oct 22 01:10:39 2021 read 30734747 cycles Fri Oct 22 01:10:45 2021 matrix is 30734569 x 30734747 (15552.1 MB) with weight 4703455832 (153.03/col) Fri Oct 22 01:10:45 2021 sparse part has weight 3708075492 (120.65/col) Fri Oct 22 01:21:13 2021 filtering completed in 2 passes Fri Oct 22 01:21:20 2021 matrix is 30733618 x 30733796 (15552.0 MB) with weight 4703413066 (153.04/col) Fri Oct 22 01:21:20 2021 sparse part has weight 3708063906 (120.65/col) Fri Oct 22 01:24:50 2021 matrix starts at (0, 0) Fri Oct 22 01:24:55 2021 matrix is 30733618 x 30733796 (15552.0 MB) with weight 4703413066 (153.04/col) Fri Oct 22 01:24:55 2021 sparse part has weight 3708063906 (120.65/col) Fri Oct 22 01:24:55 2021 saving the first 112 matrix rows for later Fri Oct 22 01:25:02 2021 matrix includes 128 packed rows Fri Oct 22 01:25:10 2021 matrix is 30733506 x 30733796 (14426.1 MB) with weight 3658634078 (119.04/col) Fri Oct 22 01:25:10 2021 sparse part has weight 3412922188 (111.05/col) Fri Oct 22 01:25:11 2021 using GPU 0 (NVIDIA A100-SXM4-40GB) Fri Oct 22 01:25:11 2021 selected card has CUDA arch 8.0 Fri Oct 22 01:30:54 2021 commencing Lanczos iteration Fri Oct 22 01:30:56 2021 memory use: 30728.1 MB Fri Oct 22 01:31:02 2021 linear algebra at 0.0%, ETA 27h56m Fri Oct 22 01:31:03 2021 checkpointing every 1230000 dimensions
 2021-10-22, 05:54 #3141 frmky     Jul 2003 So Cal 3×751 Posts Try using VBITS=384 (or 256 if 384 uses too much memory). It should be a bit faster.
2021-10-22, 13:36   #3142
ryanp

Jun 2012
Boulder, CO

23×43 Posts

Quote:
 Originally Posted by frmky Try using VBITS=384 (or 256 if 384 uses too much memory). It should be a bit faster.
Thanks -- good to know for the future, though I probably won't restart this job now. (I asked over in the msieve LA thread how to determine reasonable values for VBITS and block_nzz, other than "trial and error" )

 2021-10-23, 13:54 #3143 ryanp     Jun 2012 Boulder, CO 5308 Posts Got a few more terms done. Unfortunately, looks like there's a 2^2 · 3^3 · 7 now. Working on ECM for the c196 @i12606.
 2021-11-05, 19:01 #3144 ryanp     Jun 2012 Boulder, CO 23×43 Posts I am working on the c196 at index 12606 now.
2021-11-11, 04:30   #3145
frmky

Jul 2003
So Cal

8CD16 Posts

Quote:
 Originally Posted by ryanp I am working on the c196 at index 12606 now.

 2021-11-11, 11:16 #3146 unconnected     May 2009 Russia, Moscow 52048 Posts I've added few iterations, now C156@i12609, t40 was done on it. Last fiddled with by unconnected on 2021-11-11 at 11:16

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