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1) Message boards : Number crunching : 2019 Tour de Primes (Message 126796)
Posted 468 days ago by Profile Todderbert
Found a second PPSE prime this month. I was wondering what the additional text meant on the find: 6885*2^1521067+1 is a Factor of xGF(1521065,11,5)!!!! (1711.170000 seconds)

Your prime divides the (huge) extended Generalized Fermat number 2^11^1521065+2^5^1521065.

Every Proth prime might be an xGF, GF, or even Fermat number divisor. Last year, only 10 xGF divisors were found (among 497 primes of Proth form), so they are less common than new Top 100 primes nowadays. The most recent GF divisor was found in August 2017, the most recent Fermat number divisor back in February 2015.


Thank you for the explanation.
2) Message boards : Number crunching : 2019 Tour de Primes (Message 126782)
Posted 468 days ago by Profile Todderbert
Found a second PPSE prime this month. I was wondering what the additional text meant on the find: 6885*2^1521067+1 is a Factor of xGF(1521065,11,5)!!!! (1711.170000 seconds)
3) Message boards : Number crunching : 2019 Tour de Primes (Message 126363)
Posted 475 days ago by Profile Todderbert
Found my first PPSE prime for 2019. Took 5,295 tasks.

Do most of you switch over to looking for Megas at this point or do you like to go for multiples? Just wondering.
4) Message boards : Number crunching : 2019 Tour de Primes (Message 126086)
Posted 478 days ago by Profile Todderbert
Exciting, just ran across this Tour. Hopefully I will find a Prime this year.

Congrats to those who already have some behind their belt.
5) Message boards : Sophie Germain Prime Search : First Prime (Message 112719)
Posted 880 days ago by Profile Todderbert
My first prime was a DC of a SGS number. Exciting! Then I jumped over to PPS-Mega and was a DC on my first Mega prime! Fun projects.
6) Message boards : Number crunching : Pierre de Fermat's Birthday Challenge (Message 111561)
Posted 921 days ago by Profile Todderbert

Yes on the GPUs. GFN-17-Low is your best choice.

On the CPU it doesn't matter and you can run whichever of those three you want. If the CPUs have hyperthreading, you're probably better off turning it on for this challenge.

I recommend leaving one CPU core free to feed the GPU(s).

On my system (i5-4760K and GTX 1060 6GB) I plan on running GFN-17-Low on the GPU and 3x GFN-15 tasks on the CPU. On the CPU, my thinking is I'd rather be running shorter tasks, and I'm more likely to find a prime on smaller numbers. But in terms of points, the three GFNs by design produce very similar amounts of credit.

In theory, the same should be true for GPUs too, but today's GPUs are just too large to run efficiently on the small tasks. This makes them relatively more productive on the larger GFN-17-Low tasks.


I'm going to try this same setup, makes sense and will most likely have a few extra points at the end of the challenge due to not having as many outstanding units still crunching away. Noticed it takes five or so hours on my CPUs for GFN 17s.
7) Message boards : Number crunching : Pierre de Fermat's Birthday Challenge (Message 111553)
Posted 922 days ago by Profile Todderbert
Question: I plan to run the GFN 17 Low on my CPUs and GPUs, is that point effective? Mainly low power GPUs, 960s, 1050Tis, 750Tis and one Titan Black. The processors are mostly the "K" Haswell variety.
8) Message boards : Number crunching : Waiting for wingmen... (Message 111257)
Posted 931 days ago by Profile Todderbert
Actually that's really good info, thanks. SR5 all the way baby!
9) Message boards : Number crunching : Target for 2017: 200 Mega Primes (Message 111129)
Posted 935 days ago by Profile Todderbert
I just started two months ago here on PrimeGrid and have had the honor of double checking a recent PPS-Mega Prime. Very exciting. I was just moving from one project to another trying to figure out which Prime hunt is for me.


That's nice, congrats !
I joined PG 4 days before you did and have only found some short AP's, but no primes.
Let's keep crunching !


Thanks, just started the SR5 project. I like the compute times.
10) Message boards : Number crunching : Expectations too high for 1080 ti? (Message 111087)
Posted 937 days ago by Profile Todderbert
I had to down clock some 1050Tis because they would run up to 80C and start throttling. I have the single fan variety, not sure if the dual fan model would have helped much. So they are running -200mhz and fan speeds of 100% to keep them around 67C. Times put them under my 960s..sorta of a bummer because they outperform the 960s on Einstein and Seti.


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