20 Easy Pieces - The Remaining 29-bit Jobs

[swellman]

A list of the fastest sieving composites remaining in the project. List is sorted by increasing ETA, ranging from 1-3 weeks on an older i7 Windows machine. Suggested polys attached (or build your own). Some low hanging fruit - eat up!

C182_124_110 (reserved)
C179_125_59 (reserved)
C187_125_61 (reserved)
C179_140_37 (factored)
C192_125_58 (reserved)
C200_127_55 (reserved)
C218_137_42 (reserved)
C191_134_45 (reserved)
C208_143_36 (factored)
C212_121_69 (reserved)
C194_132_86 (reserved)
C192_130_49 (reserved)
C186_145_34 (factored)
C202_138_41 (reserved)
C185_131_51 (reserved)
C208_139_42 (factored)
C214_121_71 (reserved)
C173_136_43 (reserved)
C171_133_48 (reserved)
C172_145_36 (factored)

[NorbSchneider]

How can I use this .job files in msieve, to do snfs sieving?
msieve -ns, what parameter?, file name and format for the polynomial?

[fivemack]

msieve is not the right tool for snfs sieving; the files are in the right format for gnfs-lasieve4I14e.

[Dubslow]

As far as I know, swellman uses Yafu to generate the polys, and Yafu can automate the rest of the factoring as well (rather than manually fiddling with gnfs-lasieve and then msieve).

[swellman]

Originally Posted by NorbSchneider

How can I use this .job files in msieve, to do snfs sieving?
msieve -ns, what parameter?, file name and format for the polynomial?

I do use YAFU for most factoring tasks, as Dubslow mentions. It handles things like multithreading and sieving limits pretty cleanly. If you don't have YAFU, it's easy to download and setup. Refer to the documentation or the YAFU subforum if you need help.

If you decide to use YAFU, just remember to rename the .job file of interest to nfs.job and make sure it's in the same directory as the YAFU executable. The command syntax for sieving n on the rational side is

yafu "nfs(n)" -v -r -R -ns x,y

where x = rlim/2 and y = x + range of special_q to be sieved. The algebraic side would use the -a flag in lieu of -r.

I often run a small interval of spec_q of 2000, just to make sure everything is working as it should. Then run the command again with no -ns x,y flag and YAFU will run the job from the last spec_q until sieving is complete, then automatically go through the entire NFS process until factors are found.

[Dubslow]

Originally Posted by swellman

The command syntax for sieving n on the rational side is

yafu "nfs(n)" -v -r -R -ns x,y

where x = rlim/2 and y = x + range of special_q to be sieved. The algebraic side would use the -a flag in lieu of -r.

I often run a small interval of spec_q of 2000, just to make sure everything is working as it should. Then run the command again with no -ns x,y flag and YAFU will run the job from the last spec_q until sieving is complete, then automatically go through the entire NFS process until factors are found.

Yafu ought to automatically detect which side is better to sieve on (both by analysis of the poly, and IIRC, string analysis of comments in the poly file).