mersenneforum.org  

Go Back   mersenneforum.org > Factoring Projects > FactorDB

Reply
 
Thread Tools
Old 2017-11-06, 16:54   #287
GeoffreyY
 
"Geoffrey Yeung"
Feb 2017
London

2×32 Posts
Default

I don't expect to reach 2000 until the beginning of next week, plus I'm having issues here and there, with some numbers aborting early or being stuck.

So do feel free to continue working on 2xxx range in the mean while, I'll post here when and if I reach 2k.

Also I just realised factordb provides the input file. I've been grabbing numbers in batch (eg here) and making my own input files instead, using simple scripts. Maybe that's why I'm having problems. Are you guys downloading those files via some api or something?

Again, sorry about not posting earlier. I forgot this forum also handles factordb, amongst many other things.
GeoffreyY is offline   Reply With Quote
Old 2017-11-07, 05:45   #288
EdH
 
EdH's Avatar
 
"Ed Hall"
Dec 2009
Adirondack Mtns

1101011101012 Posts
Default

Quote:
Originally Posted by GeoffreyY View Post
I don't expect to reach 2000 until the beginning of next week, plus I'm having issues here and there, with some numbers aborting early or being stuck.

So do feel free to continue working on 2xxx range in the mean while, I'll post here when and if I reach 2k.

Also I just realised factordb provides the input file. I've been grabbing numbers in batch (eg here) and making my own input files instead, using simple scripts. Maybe that's why I'm having problems. Are you guys downloading those files via some api or something?

Again, sorry about not posting earlier. I forgot this forum also handles factordb, amongst many other things.
I'll move back down tomorrow, then.

I'm using a script to capture several files at one call and then distribute the files to several machines. You can use the download page to d/l a batch of primo input files or I use the following:
Code:
wget 'http://factordb.com/primobatch.php?digits=2000&files=40&start=Generate%20Zip' -O sourceIns/primo2000.zip
to get 40 files starting at 2000.
EdH is offline   Reply With Quote
Old 2017-11-16, 15:28   #289
EdH
 
EdH's Avatar
 
"Ed Hall"
Dec 2009
Adirondack Mtns

5·13·53 Posts
Default

I haven't seen any activity from GeoffreyY for over a week, Pakaran is taking a break and the PRP list below 3000 dd has grown to over 1000. I'm going to move my lower bounds down to 1500 dd for the short term and clear a few. If anyone is working there, let me know and I'll move back up.
EdH is offline   Reply With Quote
Old 2017-11-29, 16:06   #290
EdH
 
EdH's Avatar
 
"Ed Hall"
Dec 2009
Adirondack Mtns

5·13·53 Posts
Default

I've now seen no activity from anyone in the lower area, and there are now over 2k below 2k. I'm going to run them all and then set my lower bound to 1k dd for the time being. Under 1k should populate again and I'll let it build for a while in case someone wants some easier numbers, but unless I see activity, I'll clear it every now and then - at least while my interest remains...
EdH is offline   Reply With Quote
Old 2017-12-18, 16:20   #291
EdH
 
EdH's Avatar
 
"Ed Hall"
Dec 2009
Adirondack Mtns

65658 Posts
Default Have I really scared everyone away?

Am I the only one working below 4000 dd now? Unless someone wants some of the area, I'll continue daily work from 1000 dd up and whenever I see the region from 300-1000 reach 1k candidates, I'll clear those. If someone else wants to work any of this region, let me know and I'll back off.
EdH is offline   Reply With Quote
Old 2017-12-21, 16:41   #292
chris2be8
 
chris2be8's Avatar
 
Sep 2009

111100101012 Posts
Default

Someone is adding a lot of (b^n-1)/divisor PRPs to factordb. I've been running my script to add algebraic factors to N-1 when it's (b^n-1)/(b-1) and prove prime by N-1 when possible, but that only proves a few % of the PRPs.

The last run proved 135 numbers prime. But I hit the hourly limit of 750 seconds CPU-time during the run. So I'm not planning to run it more than once per day.

Some of the numbers it can't prove can be done by factoring smallish algebraic factors to get N-1 to 33% factored. But that's only worth if if they of a size I would want to factor sooner or later anyway.

Does anyone know where the PRPs are coming from? They could be Odd Perfect related but that's just a guess.

Chris
chris2be8 is offline   Reply With Quote
Old 2017-12-21, 17:08   #293
EdH
 
EdH's Avatar
 
"Ed Hall"
Dec 2009
Adirondack Mtns

5·13·53 Posts
Default

Quote:
Originally Posted by chris2be8 View Post
Someone is adding a lot of (b^n-1)/divisor PRPs to factordb. I've been running my script to add algebraic factors to N-1 when it's (b^n-1)/(b-1) and prove prime by N-1 when possible, but that only proves a few % of the PRPs.

The last run proved 135 numbers prime. But I hit the hourly limit of 750 seconds CPU-time during the run. So I'm not planning to run it more than once per day.

Some of the numbers it can't prove can be done by factoring smallish algebraic factors to get N-1 to 33% factored. But that's only worth if if they of a size I would want to factor sooner or later anyway.

Does anyone know where the PRPs are coming from? They could be Odd Perfect related but that's just a guess.

Chris
I had noticed that occasionally the number of PRPs below 1000 would decrease. Should I coordinate clearing those out with you? I was just grabbing the bunch and doing a full run on them whenever they got above 1k in number. Or, I could work them in smaller batches, or even leave the area alone for now. I kind of like the idea of keeping the number of smaller PRPs down somewhat, at least for now.
EdH is offline   Reply With Quote
Old 2017-12-21, 17:17   #294
chris2be8
 
chris2be8's Avatar
 
Sep 2009

79516 Posts
Default

I don't think we need to co-ordinate work. All I've been doing is clearing out the easy cases. I can't do anything about ones where N-1 doesn't have algebraic factors, so those just build up.

Chris
chris2be8 is offline   Reply With Quote
Old 2018-01-21, 17:27   #295
EdH
 
EdH's Avatar
 
"Ed Hall"
Dec 2009
Adirondack Mtns

5·13·53 Posts
Default

Not sure if anyone (other than maybe chris2be8) cares, however, just in case:

I am seeing a large addition of the higher 9xx dd candidates piling up. I am adjusting my script to use the lower bound of 900 for now.
EdH is offline   Reply With Quote
Old 2018-01-28, 02:20   #296
pakaran
 
pakaran's Avatar
 
Aug 2002

3×83 Posts
Default

Is there anything I can help with?
pakaran is offline   Reply With Quote
Old 2018-01-28, 04:05   #297
EdH
 
EdH's Avatar
 
"Ed Hall"
Dec 2009
Adirondack Mtns

5×13×53 Posts
Default

Quote:
Originally Posted by pakaran View Post
Is there anything I can help with?
Sure! Clean up all the new arrivals below 3000 dd. I'll move back up to 3000 for my low end. There are three bad candidates in the 2xxx area. They'll show composite, but won't take too long to fail. There's no way to clear them right now.

Thanks!

Last fiddled with by EdH on 2018-01-28 at 04:07 Reason: spelling...
EdH is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fixup Old Primo Certificate? wblipp FactorDB 1 2012-05-28 03:16
Invalid certificate? IvanP FactorDB 3 2012-05-11 12:17
Could Moore's law be purposely used for marketing purposes? jasong Science & Technology 10 2007-01-19 19:04
certificate of appreciation Unregistered Information & Answers 13 2004-04-28 06:24

All times are UTC. The time now is 13:06.

Tue Nov 24 13:06:38 UTC 2020 up 75 days, 10:17, 4 users, load averages: 1.56, 1.93, 2.03

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, 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.