20220628, 16:50  #518  
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Aug 2009
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20220628, 17:48  #519 
Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
26624_{8} Posts 
That is why I drew them to people's attention. Simple representation, few clearly usable algebraic properties, observed high(ish) density of (pseudo)primes and a wide range of sizes.

20220628, 18:47  #520  
"Mark"
Apr 2003
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When I last tested a range for all 20000 < x < 30000 and 5000 < y < 30000, I still had over 3 million terms left at 15e9 after many days of sieving. So if you consider that a GPU can do hundreds of primes at a time, one quickly sees that memory is going to be an issue. In fact the movement of data between GPU and CPU is the bottleneck. Still faster than CPU alone, but a noticeable bottleneck. I would like to try this on an Apple M1 since the CPU and GPU share memory. I have not finished the work to port to Metal as I haven't had time to work on it. 

20220628, 21:59  #521  
Sep 2010
Weston, Ontario
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20220628, 23:50  #522  
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Aug 2009
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4761_{8} Posts 
I have seen ABCD and similar before. It was when I was running Riesel primes for a project four years ago. It has been so long that I do not remember how to run them. I could not get OpenPFGW to accept anything I presented to it. Then, I tried the below:
Quote:
Many thanks! 

20220629, 00:53  #523  
"Mark"
Apr 2003
Between here and the
19·367 Posts 
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20220629, 00:55  #524  
"Mark"
Apr 2003
Between here and the
19·367 Posts 
Quote:
Last fiddled with by rogue on 20220629 at 00:57 

20220629, 05:59  #525  
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Aug 2009
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It appears in many posts I looked at above, everyone was using fivedigit numbers. I will just run something smaller for an overnight test. Do they have something they are choosing them from? Thanks! 

20220629, 13:05  #526 
"Mark"
Apr 2003
Between here and the
19·367 Posts 

20220629, 14:40  #527 
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Aug 2009
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9F1_{16} Posts 

20220629, 16:27  #528 
"Mark"
Apr 2003
Between here and the
19×367 Posts 
The latest build of xyyxsievecl is in the mtsieve page. This assume you have an OpenCL compatible GPU. You might need to d/l drivers.

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