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 2017-11-06, 16:54 #287 GeoffreyY   "Geoffrey Yeung" Feb 2017 London 2·32 Posts 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.
2017-11-07, 05:45   #288
EdH

"Ed Hall"
Dec 2009

32×7×59 Posts

Quote:
 Originally Posted by GeoffreyY 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.

 2017-11-16, 15:28 #289 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 32·7·59 Posts 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.
 2017-11-29, 16:06 #290 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 32·7·59 Posts 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...
 2017-12-18, 16:20 #291 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 32×7×59 Posts 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.
 2017-12-21, 16:41 #292 chris2be8     Sep 2009 2×1,021 Posts 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
2017-12-21, 17:08   #293
EdH

"Ed Hall"
Dec 2009

32×7×59 Posts

Quote:
 Originally Posted by chris2be8 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.

 2017-12-21, 17:17 #294 chris2be8     Sep 2009 2×1,021 Posts 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
 2018-01-21, 17:27 #295 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 32×7×59 Posts 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.
 2018-01-28, 02:20 #296 pakaran     Aug 2002 3×83 Posts Is there anything I can help with?
2018-01-28, 04:05   #297
EdH

"Ed Hall"
Dec 2009

32·7·59 Posts

Quote:
 Originally Posted by pakaran 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...

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