20211015, 17:03  #3136 
Jun 2012
Boulder, CO
101001011_{2} Posts 
Got a nice ECM hit:
Code:
GMPECM 7.0.5dev [configured with GMP 6.2.0, GWNUM 30.4, enableasmredc, enableassert] [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 20211015 at 17:25 
20211016, 10:13  #3137 
"Seth"
Apr 2019
101110001_{2} 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. 
20211020, 19:47  #3138 
Jun 2012
Boulder, CO
331 Posts 
I've hit the c186 blocker @i12601 with a fair bit of ECM, but it didn't crack. Running GNFS on it now.

20211021, 22:20  #3139 
"Seth"
Apr 2019
3^{2}×41 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 
20211022, 01:45  #3140 
Jun 2012
Boulder, CO
331 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 P1/P+1/ECM available, skipping Fri Oct 22 00:23:36 2021 commencing number field sieve (186digit 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 3.410e18, alpha 6.359, combined = 1.531e16 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 A100SXM440GB) 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 
20211022, 05:54  #3141 
Jul 2003
So Cal
2·7·157 Posts 
Try using VBITS=384 (or 256 if 384 uses too much memory). It should be a bit faster.

20211022, 13:36  #3142 
Jun 2012
Boulder, CO
331 Posts 
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" )

20211023, 13:54  #3143 
Jun 2012
Boulder, CO
331 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.

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