4_427p factored
 

[CODE]p76 factor: 6590288709247821354314951578912494565570641992139039816841327314104027237723
p148 factor: 4153625764573340770548548215538580587857563211233163129139412909171344561539806199326985775903102141113181810629731660763150078498061645974914445961[/CODE]
346M unique relations built a 28.6M matrix using TD=140.
Solve time about 810 hours. (-t 4)

Log at: [url]https://pastebin.com/UuqjS5fG[/url]

This one barely fit into my machine. I had to boot into console mode (init 3) and run it stand alone for a month plus.

[QUOTE=swellman;544009]The later part of this thread [url]https://www.mersenneforum.org/showthread.php?t=20024[/url] has each abbreviation amended to the original post requesting it be added to one of the NFS@Home sievers (14e or 15e).[/QUOTE]

Thanks. Actually it wasn't them I was asking about; it was things like 4_427p.

[QUOTE=BudgieJane;544133]Thanks. Actually it wasn't them I was asking about; it was things like 4_427p.[/QUOTE]

Abbreviation formats are specific to the particular project from which the number is taken. 4_427p comes from the GCW (Generalized Cullen-Woodall numbers) project, from which numbers are either GC(a,n) or GW(a,n), depending on whether you add or subtract one. The "p" in 4_427p presumably means "plus", so this number is GC(a,n), which is 427*4^427+1.

In general, you need to know something about each project in order to understand what the abbreviation means.

Thank you very much..

[QUOTE=jyb;544139]Abbreviation formats are specific to the particular project from which the number is taken. 4_427p comes from the GCW (Generalized Cullen-Woodall numbers) project, from which numbers are either GC(a,n) or GW(a,n), depending on whether you add or subtract one. The "p" in 4_427p presumably means "plus", so this number is GC(a,n), which is 427*4^427+1.

In general, you need to know something about each project in order to understand what the abbreviation means.[/QUOTE]

(58^139+1)/146421496528758769421 done:
[code]
p94 factor: 3716258160433092711693365811703481911770468334031963966843930768019506285668038493249221762569
p132 factor: 240314728071096425063134235654518614002041231884071469539688249592235703592517040488325415908131634662988668988012643869443174048477
[/code]

Chris

288__869_3m1 factored
 

[QUOTE=richs;543151]Reserving 288__869_3m1[/QUOTE]

[CODE]p54 factor: 121973030257185685986599772476464754369990071482786463
p101 factor: 16189355379168774385358405890290279035508076618251822822701573843840500918179144439136207057507884693[/CODE]

Approximately 7.9 hours on 6 threads of a Core i7-10510U with 12 GB memory for a 2.78M matrix at TD=120.

Log attached and at [URL="https://pastebin.com/xY8aws8i"]https://pastebin.com/xY8aws8i[/URL]

Factors added to FDB.

Unless somebody else wants it can I please reserve 515__401_5m1

Taking 251__143_13m1.

f53_142p1 Factored
 

Brent number f53_142p1 is now factored
[CODE]
prp74 factor: 18323531662639308499761928271646822622741218139262087373054377931926486293
prp115 factor: 1539851741644494997572564260366124906414342268497126011955901453093952211564868706169344773275341508142730822327597
[/CODE]

Details at [url]https://pastebin.com/GQF4SnGY[/url]

I've built a matrix for (41^152+1)/162997214192152441209917000011928957192497672515778, f41_152p1, (density 100, it wouldn't build at 110). ETA 7 days 8 hours.

The good news is that wget can continue a download to get just relations added since the last run. So I did a download between each attempt to build a matrix to get as good a one as possible. And I can script it so I don't have to be at the keyboard when it happens.

Chris

Taking f18_197p1.