mersenneforum.org  

Go Back   mersenneforum.org > Factoring Projects > NFS@Home

Reply
 
Thread Tools
Old 2015-07-04, 18:28   #1
pinhodecarlos
 
pinhodecarlos's Avatar
 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK

37·131 Posts
Default NFS@Home 2,1207-, maybe?

Greg,

Shall we go for the most wanted 2,1207-?

Carlos

Last fiddled with by Batalov on 2015-07-04 at 20:51 Reason: ftfy
pinhodecarlos is online now   Reply With Quote
Old 2015-07-04, 20:18   #2
pinhodecarlos
 
pinhodecarlos's Avatar
 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK

12EF16 Posts
Default

Number should be
2,1207-.
pinhodecarlos is online now   Reply With Quote
Old 2015-07-04, 23:21   #3
R.D. Silverman
 
R.D. Silverman's Avatar
 
Nov 2003

22×5×373 Posts
Default

Quote:
Originally Posted by pinhodecarlos View Post
Number should be
2,1207-.
Hell, NO!
R.D. Silverman is offline   Reply With Quote
Old 2015-07-05, 00:18   #4
pinhodecarlos
 
pinhodecarlos's Avatar
 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK

37×131 Posts
Default

Please advise for one candidate.
pinhodecarlos is online now   Reply With Quote
Old 2015-07-05, 00:25   #5
Batalov
 
Batalov's Avatar
 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

47×197 Posts
Default

2,983+ c236 Most Wanted
2,989+ c249 Most Wanted
2,991+ c224 Wanted
and three Wanted 2L/Ms could help finish the 2+-Tables to 1000 bits.
No first holes (or any holes, for that matter) were done for a long time already. (not mine, -- Wagstaff's, in essence).
Batalov is offline   Reply With Quote
Old 2015-07-06, 12:37   #6
R.D. Silverman
 
R.D. Silverman's Avatar
 
Nov 2003

1D2416 Posts
Default

Quote:
Originally Posted by Batalov View Post
2,983+ c236 Most Wanted
2,989+ c249 Most Wanted
2,991+ c224 Wanted
and three Wanted 2L/Ms could help finish the 2+-Tables to 1000 bits.
No first holes (or any holes, for that matter) were done for a long time already. (not mine, -- Wagstaff's, in essence).
Indeed. I have to ask why 6,490+ and 2,1285- are being done by GNFS.
They are very recent extensions.

Meanwhile composites that were part of the tables from 40+ years ago are
not being done. There are a number of such candidates in the same size
range as the two numbers above.

This seems to lack a sense of historical perspective.

Didn't your mom ever tell you: finish what you start before doing something new??????
R.D. Silverman is offline   Reply With Quote
Old 2015-07-06, 16:02   #7
jyb
 
jyb's Avatar
 
Aug 2005
Seattle, WA

3×5×109 Posts
Default

Quote:
Originally Posted by Batalov View Post
2,983+ c236 Most Wanted
2,989+ c249 Most Wanted
2,991+ c224 Wanted
and three Wanted 2L/Ms could help finish the 2+-Tables to 1000 bits.
No first holes (or any holes, for that matter) were done for a long time already. (not mine, -- Wagstaff's, in essence).
Setting aside the question of whether there are better candidates, is it even possible for NFS@Home to factor 2,1207-? This number has an SNFS difficulty of 363 (or 342 with an octic). NFS@Home has never come anywhere close to doing a number that difficult before.
jyb is offline   Reply With Quote
Old 2015-07-06, 17:58   #8
debrouxl
 
debrouxl's Avatar
 
Sep 2009

977 Posts
Default

lasieve5e may be able to sieve 2^1207-1, but post-processing would be a chore... Post-processing the record-setting 2^1061-1 (for publicly available sieving resources) already took its fair share of HPC quota.
debrouxl is offline   Reply With Quote
Old 2015-07-07, 10:45   #9
xilman
Bamboozled!
 
xilman's Avatar
 
"π’‰Ίπ’ŒŒπ’‡·π’†·π’€­"
May 2003
Down not across

244078 Posts
Default

Quote:
Originally Posted by R.D. Silverman View Post
Indeed. I have to ask why 6,490+ and 2,1285- are being done by GNFS.
They are very recent extensions.

Meanwhile composites that were part of the tables from 40+ years ago are
not being done. There are a number of such candidates in the same size
range as the two numbers above.

This seems to lack a sense of historical perspective.

Didn't your mom ever tell you: finish what you start before doing something new??????
While I agree completely that there are much better candidates than 2,1207- which should be done first, I feel that I should also remind you to take a look at the domain name where we are posting.

In that context, perhaps, factoring M1207 might make more sense than factoring M1966. I can't think of many other contexts where that applies.
xilman is offline   Reply With Quote
Old 2015-07-07, 10:56   #10
R.D. Silverman
 
R.D. Silverman's Avatar
 
Nov 2003

22×5×373 Posts
Default

Quote:
Originally Posted by debrouxl View Post
lasieve5e may be able to sieve 2^1207-1, but post-processing would be a chore... Post-processing the record-setting 2^1061-1 (for publicly available sieving resources) already took its fair share of HPC quota.
Sieving memory will be a major problem. I expect that each instance of the siever will use
enough memory so that users will not be able to use all the cores on a given computer.
This will slow things down.

Also, can msieve handle the 34 or 35-bit large primes that are present during filtering
and post-processing? Does the siever support 35-bit large primes? The factor base will
need to be quite large, as will the sieve region --> mucho memory.
R.D. Silverman is offline   Reply With Quote
Old 2015-07-07, 10:58   #11
R.D. Silverman
 
R.D. Silverman's Avatar
 
Nov 2003

22·5·373 Posts
Default

Quote:
Originally Posted by xilman View Post
While I agree completely that there are much better candidates than 2,1207- which should be done first, I feel that I should also remind you to take a look at the domain name where we are posting.

In that context, perhaps, factoring M1207 might make more sense than factoring M1966. I can't think of many other contexts where that applies.
But the BOINC project does not limit itself to GIMPS related computing...........
R.D. Silverman is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
15e batch of WU's NFS@Home pinhodecarlos NFS@Home 31 2020-01-21 21:49
Folding @ Home MattcAnderson Soap Box 2 2014-09-18 16:11
Home Schooling Wacky Soap Box 77 2014-08-13 10:20
cats in need of home: science_man_88 Lounge 14 2011-07-29 17:01
Home Primes... Xyzzy Programming 8 2005-01-06 15:32

All times are UTC. The time now is 21:40.

Tue Jan 19 21:40:21 UTC 2021 up 47 days, 17:51, 0 users, load averages: 1.76, 1.92, 1.88

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.