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 2017-09-10, 07:18 #188 yoyo     Oct 2006 Berlin, Germany 22·32·17 Posts Yafu takes only Aliquot Sequences. Of course there are also some small composites to be done on those sequences.
 2017-09-11, 15:16 #189 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 47·79 Posts Perhaps it's already known, (I didn't search around), but one of the 79 digit entries in the composite listing is a certifiable prime: 1111111111111111111111111111111111111111111111111111111111111111111111111111091 It's a blocker for working up from 76 digits. Random work can still function, but every time it gets picked, it wastes a machine cycle. I've set one of my faster machines to cover that area and am moving all the others above it. Edit: Just to add, that most of my machines will be set to work within 300 composites above an 80 digit low end, with a couple covering the 76-80 area. That should define an area to help deconflict with others' work. Last fiddled with by EdH on 2017-09-11 at 15:47
 2017-09-11, 15:42 #190 chris2be8     Sep 2009 23×3×5×17 Posts It's been known for a while. I've updated my scripts to ignore numbers that are already prime or less than 19 digits (there are several such numbers that factordb thinks belong in the 79-84 digit range). Chris
2017-09-11, 15:51   #191
EdH

"Ed Hall"
Dec 2009

47·79 Posts

Quote:
 Originally Posted by chris2be8 It's been known for a while. I've updated my scripts to ignore numbers that are already prime or less than 19 digits (there are several such numbers that factordb thinks belong in the 79-84 digit range). Chris
Thanks. I probably don't really need to worry about it. But it gets annoying to keep seeing it show up frequently if I'm trying to clear a small region. For now I've adjusted my machines to mostly avoid it.

 2017-09-11, 16:20 #192 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 47·79 Posts mindig is not functioning correctly now The mindig option appears to be acting up. I'm getting a lot of 6-10 digit composites being returned. When I try manually, via http, I get similar results: Code: http://www.factordb.com/listtype.php...age=1&start=11 should give me an 80+ digit number, but it doesn't. Code: http://www.factordb.com/listtype.php...age=20&start=0 should give me 80+ and up, shouldn't it? Thoughts? Attached Thumbnails
 2017-09-11, 18:33 #193 RichD     Sep 2008 Kansas 22·3·277 Posts These are known problems that have been around for a bit. I believe it has to do with a number followed by several #s, such as 5####. There is an inconsistency between the input parser and another internal evaluation process. Syd did a great job on this website and was trying to please everyone. I think anything more than two consecutive #s should be ignored or return an error. Until Syd finds time to work on it you are going to have to find a work around. Bummer...
2017-09-11, 18:57   #194
sean

Aug 2004
New Zealand

2·3·37 Posts

Quote:
 Originally Posted by EdH I noticed that c112s are much more scarce than the surrounding composites. Your work, or is there a different explanation?
That's me. I picked a particular size and tried harder on those. It taken a few months to get it that low.

2017-09-11, 21:46   #195
EdH

"Ed Hall"
Dec 2009

47·79 Posts

Quote:
 Originally Posted by RichD These are known problems that have been around for a bit. I believe it has to do with a number followed by several #s, such as 5####. There is an inconsistency between the input parser and another internal evaluation process. Syd did a great job on this website and was trying to please everyone. I think anything more than two consecutive #s should be ignored or return an error. Until Syd finds time to work on it you are going to have to find a work around. Bummer...
I'm familiar with the ## troubles as you have seen over in the primo certificate (PRP) thread, but didn't notice these are some of those troublesome culprits. But, what about the earlier one I posted? It has no # symbols:
Code:
(10^79-181)%(10^79-1)/9
As to a work around, as long as they are small, they're just a nuisance, but larger ones can waste a bunch of effort

Quote:
 Originally Posted by sean That's me. I picked a particular size and tried harder on those. It taken a few months to get it that low.
Thanks for the explanation. You've made quite a dent.

2017-09-12, 00:27   #196
RichD

Sep 2008
Kansas

22·3·277 Posts

Quote:
 Originally Posted by EdH But, what about the earlier one I posted? It has no # symbols:
Sorry, I'm not familiar will all the DB problems. I've seen some inquiries return no list, which is a bit frustrating.

 2017-09-12, 18:15 #197 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 47·79 Posts Did C100s really just increase by 20k?
 2017-09-12, 23:35 #198 RichD     Sep 2008 Kansas 22×3×277 Posts Actually closer to 23K but not by me. 🙂

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