20220305, 09:17  #1 
Feb 2020
Germany
110010_{2} Posts 
Big Triple Prime found  help is needed
Hi,
I was very lucky and found a triple prime which will make it into the top 10 of Chris Caldwell's prime database with 13389 digits (places 79). After a ~24 h run of the +5 form with Primo I estimated the overall runtime to be about 90100 days with my AMD 3600 6core CPU. At the moment I am not willing to invest this time on my personal computer. Thus I am curious if someone with significant computing power is interested in helping out with the Primo certificate and sharing the credit. regards hunson 
20220305, 09:40  #2 
Jan 2007
Germany
111101011_{2} Posts 
Congratulation !
100 days ist not true. I estimate (1,33^3,75)*6,22d * (3GHz*8Core)/(3,6GHz*6Core) =3 weeks ,100% CPU nonstop 6,22 days based on Ryzen 7 1700 8 Core 3 GHz for a 10k number under Primo 4, Ubuntu greetings Norman Last fiddled with by Cybertronic on 20220305 at 09:45 
20220305, 09:56  #3 
Feb 2020
Germany
2·5^{2} Posts 
Mh, 3 weeks would be OK to invest.
I did my estimate based on the certificate of this number with 11637 digits: https://primes.utm.edu/primes/page.php?id=132373 The overall Primo certification took 8056345s (no CPU cores mentioned). Edited After ~82000s of runtime Primo was at 43708/44477 bits. I am running Ubuntu in a VM because my machine runs on Win. Maybe I am loosing to much computing power due to the virtualization? Last fiddled with by hunson on 20220305 at 10:04 
20220305, 10:02  #4 
Jan 2007
Germany
1EB_{16} Posts 
Based on this number I get with my Ryzen 7 1700:
(1,16^3,75)*7,22d = 12,6d. In the certificate we read: 719077s = 8,3d. Sounds like a 12 Core Ryzen ! Addition: 6993977s (single) / 620250s (full) = 11,2....should be a 12 Core CPU Last fiddled with by Cybertronic on 20220305 at 10:06 
20220305, 10:11  #5 
Jan 2007
Germany
491 Posts 
Phase 1:
(43708/44477)^3,75 = 0,93 > 7% done Total Phase 1: 14 days Phase 2: most 25% of Phase 1 > 3 days Should be done in 3 weeks over all....is not slower under VM 
20220305, 16:10  #6 
Feb 2020
Germany
2·5^{2} Posts 
Could you explain your calculations? Especially the exponent 3.75, where does this come from?
Last fiddled with by hunson on 20220305 at 16:10 Reason: typo 
20220305, 16:28  #7 
Jan 2007
Germany
491 Posts 
Yes, 3.75 is a fix parameter and a consequence of many runningtimes we can study.
E.g. double the number of digits, you have 2^3.75 ~ 13 times to wait, or the downrun of bits of a number to 50% (example 20000/40000), so phase 1 is 92.3% done, 10000/40000 is 99,5% done and so on. Last fiddled with by Cybertronic on 20220305 at 16:29 
20220305, 16:37  #8 
"Oliver"
Sep 2017
Porta Westfalica, DE
1079_{10} Posts 
If you still want help, I'd glad to assist here. It will take me two or three days.

20220305, 16:44  #9 
Jan 2007
Germany
753_{8} Posts 

20220305, 16:58  #10 
"Oliver"
Sep 2017
Porta Westfalica, DE
13×83 Posts 
Unfortunately, no.
But my 16 core is rather quick with these. After giving it a second thought, two days will not be possible (most likely), so three days is my guess. My offer stands. Paul said (IIRC) that he found a way to split stage 2 onto multiple machines? 
20220305, 17:04  #11 
Jan 2007
Germany
111101011_{2} Posts 
Ah okay, so 16 cores need 1012 days...my guess.
Stage 2 on several machines ? ... yes its possible but for a 13k number it is only a tiny plus. 
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