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-   -   Reserved for MF - Sequence 4788 (https://www.mersenneforum.org/showthread.php?t=11615)

ryanp 2021-10-15 17:03

[QUOTE=EdH;590653]t50 completed on c187. Returning it to the Team. . .[/QUOTE]

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[/CODE]

SethTro 2021-10-16 10:13

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.

ryanp 2021-10-20 19:47

I've hit the c186 blocker @i12601 with a fair bit of ECM, but it didn't crack. Running GNFS on it now.

SethTro 2021-10-21 22:20

I'm now the second person to know that the C158 factors as

235135428415733585976439325229520790520225044469128317898640986440315363425440537 *193342839483052979098666287649581036752342433417784528705948363890824381981587

CADO log from the job

[URL]https://pastebin.com/3XKCNAxr[/URL]

ryanp 2021-10-22 01:45

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[/CODE]

frmky 2021-10-22 05:54

Try using VBITS=384 (or 256 if 384 uses too much memory). It should be a bit faster.

ryanp 2021-10-22 13:36

[QUOTE=frmky;591316]Try using VBITS=384 (or 256 if 384 uses too much memory). It should be a bit faster.[/QUOTE]

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" :smile:)

ryanp 2021-10-23 13:54

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.

ryanp 2021-11-05 19:01

I am working on the c196 at index 12606 now.

frmky 2021-11-11 04:30

[QUOTE=ryanp;592547]I am working on the c196 at index 12606 now.[/QUOTE]

[PASTEBIN]cQZ21qTf[/PASTEBIN]

unconnected 2021-11-11 11:16

I've added few iterations, now C156@i12609, t40 was done on it.


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