20210503, 07:40  #12 
Aug 2020
79*6581e4;3*2539e3
503 Posts 
No new primes for n < 3,600,000
Largest n in progress = 3,875,000 # of digits = 1,166,500 (rank: ~ 325) FFT size = 400k Avg. time = 4970 s Smallest n in progress = 3,600,000 # of digits = 1,085,000 (rank: ~ 395) FFT size = k Avg. time =  s Around July all sieved candidates of n < 4,100,000 should have been tested. I'm not so optimistic anymore that a prime will turn up... Last fiddled with by bur on 20210503 at 07:49 
20210529, 07:06  #13 
Aug 2020
79*6581e4;3*2539e3
503_{10} Posts 
Things progressed much faster than I expected, the last batch 4,095e6 < n < 4,100e6 will be assigned to a core today and everything should be finished until June, 10th.
If there will be no prime in these last few numbers, I'll continue by sieving the proth side to higher n and doing LLR onthefly depending on sieve/LLR times as LaurV suggested. According to prime95 I'll be able to continue singlethreaded until an FFT size of 640k is reached which will be around n = 5.6e6, which agrees nicely with the 5.3 MB of L3 each core has. I just hope a prime will turn up before testing becomes really slow. I'm set on finding a mega prime for this k though. :D Last fiddled with by bur on 20210529 at 07:08 
20210611, 10:59  #14 
Aug 2020
79*6581e4;3*2539e3
767_{8} Posts 
All n < 4,100,000 have been tested, no new primes other than the ones already posted.
Currently I'm sieving in the range of 4,100,000 < n < 10,000,000. Smallest pP range in progress: 87E12107E12 Avg. time per factor: 810 s Largest pP range in progress: 310E12330E12 Avg. time per factor: 3160 s Remaining candidates: 100,936 / 5,900,000 (1.71%) Est. time per LLR test of smallest candidate: 5600 s (n = 4,100,014) 
20210720, 17:31  #15 
Aug 2020
79*6581e4;3*2539e3
1F7_{16} Posts 
Quick update, no new primes...
All n < 4,300,000 have been tested. n < 10,000,000 sieved up to 570E12 (10,000 s / factor) Approximately 90,000 candidates remain. Largest LLRtest currently running: n = 4,450,000 FFT = 448k 6200 s / test Caldwell entry rank: 290 If the LLRruntime would increase strictly quadratic, then it'll take to around n = 5,600,000 until an LLR test takes again as long as sieving to eliminate a candidate. As a very rough estimate that should take about 7 months on the 10 core. And when will the next prime appear? Judging from Primegrid's results on other prime k values it can be a looong time. 
20210827, 17:14  #16 
Aug 2020
79*6581e4;3*2539e3
503 Posts 
To keep up with the roughly monthly updates and since it's been one year now since I started searching this k, here are the current stats:
As always, no new prime. All n < 4,600,000 have been tested. Largest LLRtest currently running: n = 4,790,000 FFT = 512k 7500 s / test Caldwell entry rank: 274 Last fiddled with by bur on 20210827 at 17:15 
20211122, 16:32  #17 
Aug 2020
79*6581e4;3*2539e3
503 Posts 
Once again, a status update with no new prime:
Sieving All n < 10,000,000 have been sieved to 800e12. Last reported time per factor: approx. 12,000 s 76,167 candidates (1.6%) are left in the range 5,250,000 < n < 10,000,000. LLR All n < 5,250,000 have been tested. Smallest LLRtest currently running: n = 5.25M FFT = 560k duration = 9975 s / test digits = 1.58M Caldwell entry rank: 254 Largest LLRtest currently running: n = 5.36e6 FFT = 560k duration = 10100 s / test digits = 1.61M Caldwell entry rank: 252 
20211122, 17:09  #18 
"Mark"
Apr 2003
Between here and the
19C1_{16} Posts 
If you have a GPU, use srsieve2cl for sieving. Depending upon the GPU, it might be faster than sr1sieve. I have a midrange GPU and it is 5x faster than sr1sieve on the same CPU.

20211124, 00:51  #19 
"AMD YES!"
Jan 2020
Bellevue, WA
2×3×13 Posts 
Where can srsieve2cl be obtained?
Last fiddled with by dannyridel on 20211124 at 00:51 
20211124, 15:23  #20 
"Mark"
Apr 2003
Between here and the
19×347 Posts 
It is part of mtsieve and can be found here: https://sourceforge.net/projects/mtsieve/

20211125, 00:17  #21  
"AMD YES!"
Jan 2020
Bellevue, WA
2×3×13 Posts 
Quote:


20211126, 00:05  #22 
"Alexander"
Nov 2008
The Alamo City
2·401 Posts 
Not to hijack this thread, but based on personal experience, I've had trouble getting my GeForce RTX 2060 to sieve faster with srsieve2cl than my Intel Core i710875H running 8 threads with sr1sieve. In fact, it's not even close with my Riesel data (at least 2to1 IIRC).

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