Reserved for MF - Sequence 4788

[ryanp]

The c196 on index 5283 (1742276725...) looks to be a tough nut to crack. I've already run 10K curves at B1=26e7 and another 10K at B1=76e8, but no luck so far.

Everyone else is encouraged to run curves too... I will be starting GNFS soon.

[henryzz]

Originally Posted by ryanp

The c196 on index 5283 (1742276725...) looks to be a tough nut to crack. I've already run 10K curves at B1=26e7 and another 10K at B1=76e8, but no luck so far.

Everyone else is encouraged to run curves too... I will be starting GNFS soon.

1 mod 4 so 50% chance of raising the power of 2

[ryanp]

Here's an update on the c196 that is the next blocker:

Wed May 11 14:54:21 2016  commencing linear algebra
Wed May 11 14:54:26 2016  read 27986211 cycles
Wed May 11 14:55:28 2016  cycles contain 77742891 unique relations
Wed May 11 15:06:48 2016  read 77742891 relations
Wed May 11 15:09:52 2016  using 20 quadratic characters above 2692049954
Wed May 11 15:18:39 2016  building initial matrix
Wed May 11 15:51:22 2016  memory use: 11806.3 MB
Wed May 11 15:51:45 2016  read 27986211 cycles
Wed May 11 15:51:54 2016  matrix is 27986032 x 27986211 (12830.1 MB) with weight 3969810634 (141.85/col)
Wed May 11 15:51:54 2016  sparse part has weight 3027502384 (108.18/col)
Wed May 11 16:01:27 2016  filtering completed in 2 passes
Wed May 11 16:01:37 2016  matrix is 27985506 x 27985685 (12830.1 MB) with weight 3969786240 (141.85/col)
Wed May 11 16:01:37 2016  sparse part has weight 3027495594 (108.18/col)
Wed May 11 16:06:46 2016  matrix starts at (0, 0)
Wed May 11 16:06:55 2016  matrix is 27985506 x 27985685 (12830.1 MB) with weight 3969786240 (141.85/col)
Wed May 11 16:06:55 2016  sparse part has weight 3027495594 (108.18/col)
Wed May 11 16:06:55 2016  saving the first 48 matrix rows for later
Wed May 11 16:07:02 2016  matrix includes 64 packed rows
Wed May 11 16:07:08 2016  matrix is 27985458 x 27985685 (12565.1 MB) with weight 3380600754 (120.80/col)
Wed May 11 16:07:08 2016  sparse part has weight 3014016578 (107.70/col)
Wed May 11 16:07:08 2016  using block size 8192 and superblock size 4423680 for processor cache size 46080 kB
Wed May 11 16:11:55 2016  commencing Lanczos iteration (64 threads)
Wed May 11 16:11:55 2016  memory use: 10771.0 MB
Wed May 11 16:13:36 2016  linear algebra at 0.0%, ETA 493h32m
Wed May 11 16:14:09 2016  checkpointing every 60000 dimensions

I am trying to see if a little more sieving and a higher target_density (trying 140) will produce a matrix with a shorter ETA.

[Dubslow]

48 hours. 48 hours to polyselect and sieve a GNFS-195. What the

[ryanp]

A bit of over-sieving and setting target_density=130 helped a bit.

Thu May 12 19:12:53 2016  building initial matrix
Thu May 12 19:51:02 2016  memory use: 12717.1 MB
Thu May 12 19:51:22 2016  read 29261281 cycles
Thu May 12 19:51:30 2016  matrix is 29233499 x 29261281 (13648.1 MB) with weight 4232633740 (144.65/col)
Thu May 12 19:51:30 2016  sparse part has weight 3226644007 (110.27/col)
Thu May 12 20:09:35 2016  filtering completed in 3 passes
Thu May 12 20:09:46 2016  matrix is 29021153 x 29021351 (13565.0 MB) with weight 4205410151 (144.91/col)
Thu May 12 20:09:46 2016  sparse part has weight 3207726920 (110.53/col)
Thu May 12 20:16:25 2016  matrix starts at (0, 0)
Thu May 12 20:16:32 2016  matrix is 29021153 x 29021351 (13565.0 MB) with weight 4205410151 (144.91/col)
Thu May 12 20:16:32 2016  sparse part has weight 3207726920 (110.53/col)
Thu May 12 20:16:32 2016  saving the first 48 matrix rows for later
Thu May 12 20:16:38 2016  matrix includes 64 packed rows
Thu May 12 20:16:44 2016  matrix is 29021105 x 29021351 (13288.3 MB) with weight 3587263101 (123.61/col)
Thu May 12 20:16:44 2016  sparse part has weight 3193239790 (110.03/col)
Thu May 12 20:16:44 2016  using block size 8192 and superblock size 4423680 for processor cache size 46080 kB
Thu May 12 20:20:47 2016  commencing Lanczos iteration (48 threads)
Thu May 12 20:20:47 2016  memory use: 11419.8 MB
Thu May 12 20:21:42 2016  linear algebra at 0.0%, ETA 276h19m
Thu May 12 20:21:59 2016  checkpointing every 110000 dimensions

[ryanp]

OK, we're almost there on the c196 blocker. Current ETA for linear algebra is about 45 hours.

[ryanp]

And onward we go....

Sat May 28 04:50:38 2016  prp93 factor: 323809855339456561150604956264226068193303136647143996452370244441487927592878373028105104267
Sat May 28 04:50:38 2016  prp103 factor: 5380554967805842623777304908323517352371059069412454635151090178974054931519218146235535260259241226243

[unconnected]

...and now we have squared 3

[LaurV]

which is actually good, that is how we get rid of them...

[Dubslow]

Originally Posted by LaurV

which is actually good, that is how we get rid of them...

Previously there was no 3, and we hope there shant be a 3 in future lines... if the 3 doesn't immediately push it over 200 digits.

(Of course we really hope for the downdriver, but that's unlikely of course...)

[ryanp]

ECM on the c192 blocker has so far come up empty. Starting sieving now.