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After a few weeks of running this project exclusively, I DCed my first prime which was pretty exciting! It came after 22415 tasks.
Just curious, for those of you running this project, what percentage of tasks result in a prime for you? I DCed another shortly after, so it's about 0.006% right now for me.
Also, since these primes are out of the 5000 range, what is the main reason you all run the project?
Have a great one! :) 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13299 ID: 53948 Credit: 224,095,798 RAC: 32,822

After a few weeks of running this project exclusively, I DCed my first prime which was pretty exciting! It came after 22415 tasks.
Just curious, for those of you running this project, what percentage of tasks result in a prime for you? I DCed another shortly after, so it's about 0.006% right now for me.
Also, since these primes are out of the 5000 range, what is the main reason you all run the project?
Have a great one! :)
Congratulations!
From the project's perspective, the purpose of running SGS is to find an SGS pair or a twin prime. Those are really rare, however. I imagine most people run SGS because it's easy to find a prime.
It's still fun to find a prime, even if it's not recorded at T5K. It's still recorded here. People also run GFN15, which won't be recorded at T5K.
And there's lots of projects outside of PrimeGrid that are too small for T5K.
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My lucky number is 75898^{524288}+1 


KeithVolunteer tester
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Joined: 8 Dec 13 Posts: 425 ID: 284516 Credit: 397,595,059 RAC: 89,822

I've done 50120 tasks and found 7 primes (6 primary and 1 DC). So that's 0.014%
I run this project because it's available to be run and there's a badge for it.
It's also a good project to switch to before starting a challenge because the units are short and you can keep crunching with minimal lost time at the start of a challenge. But PPSE can serve about the same purpose.
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My Primes
Badge Score: 2*1 + 4*2 + 6*6 + 7*7 + 9*2 + 10*1 = 123




My first prime was a DC of a SGS number. Exciting! Then I jumped over to PPSMega and was a DC on my first Mega prime! Fun projects. 


Michael GoetzVolunteer moderator Project administrator
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Joined: 21 Jan 10 Posts: 13299 ID: 53948 Credit: 224,095,798 RAC: 32,822

I've done 50120 tasks and found 7 primes (6 primary and 1 DC). So that's 0.014
For me, it's 47777 tasks and 5 primes, including DC. That's 0.010% Note that I've been here long enough that a lot of those SGS tasks were on the previous range of SGS numbers, which were faster to test and more likely to yield a prime. So take all statistics with a large grain of salt.
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My lucky number is 75898^{524288}+1 



Completed tasks 157556
Credit 4,627,762.53
Primes found 20
Percentage of tests resulting with a prime 0.0127
Again, mine include the previous range as well.
I run it because my first "love" in prime searching was the Twin Prime Search (where I was given partial credit for the largest twin when n was 195000), and SGS was pretty much the evolution of that search.
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That's awesome! Thanks for sharing  I'm learning more about these twin primes from a few of the replies. 



Congratulations Andrew I'm at 31844 tasks 0 primes, 0 Double checks. percent prime is blank as it's 0.000% 


HonzaVolunteer moderator Volunteer tester Project scientist Send message
Joined: 15 Aug 05 Posts: 1875 ID: 352 Credit: 2,990,645,542 RAC: 1,202,721

Yes, used to be easier with smaller SGS (67 years ago).
1 056 342 tasks and 203 primes.
I should do a few more before SoB challenge.
The good think about SGS is that there are a lot more primes to find...
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My stats
Badge score: 1*1 + 5*1 + 8*3 + 9*11 + 10*1 + 11*1 + 12*3 = 186 


Dave Send message
Joined: 13 Feb 12 Posts: 2765 ID: 130544 Credit: 919,293,227 RAC: 24,213

Personally 64023 tasks 5 primes 0.0078%.




Congratulations Andrew I'm at 31844 tasks 0 primes, 0 Double checks. percent prime is blank as it's 0.000% Ahh, you've gotta be close to getting one!




Completed tasks 25518
Credit 1,018,673.13
Primes found 4 (3 primary, 1 DC)
Percentage of tests resulting with a prime 0.0157 


CrunchiVolunteer tester
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Joined: 25 Nov 09 Posts: 2941 ID: 50683 Credit: 56,510,917 RAC: 720

Sophie Germain Prime Search tasks
Completed tasks 36722
Credit 1,073,791.88
Primes found 3
Percentage of tests resulting with a prime 0.0082
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314187728^^{131072}+1 GENERALIZED FERMAT :)
93*10^^{1029523}1 REPDIGIT PRIME
31*332^^{367560}+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! 



Congratulations Andrew I'm at 31844 tasks 0 primes, 0 Double checks. percent prime is blank as it's 0.000%
Ahh, you've gotta be close to getting one!
I tried hard when it was getting edged off the t5k list, now it's on the back burner, I'll try again after I hit all gold badges. 



Completed tasks: 153,899
Credit: 5,867,377
Primes found: 21 (7 primary  all in the current range, 14 DC  11 in the current range)
Percentage of tests resulting with a prime: 0.0136
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There's someone in our head but it's not us. 



Completed tasks: 100,540
Credit: 2,292,850.31
Primes found: 13 (8 Primary)
Percentage of tests resulting with a prime: 0.0129 


LumiukkoVolunteer tester Send message
Joined: 7 Jul 08 Posts: 161 ID: 25183 Credit: 701,452,297 RAC: 92,741

Completed tasks : 342523
Credit: 5,209,707.91
Primes found: 57 ? (38 initial finder + 20 doublechecker = 58)
Percentage of tests resulting with a prime: 0.0166 (0.0169)




My results look more like Crunchi's:
Completed tasks 270896
Credit 10,813,292.59
Primes found 22
Percentage of tests resulting with a prime 0.0081




Completed tasks: 50627
Credit: 2,020,742.51
Primes found: 1
Percentage of tests resulting with a prime: 0.002 


tngSend message
Joined: 29 Aug 10 Posts: 380 ID: 66603 Credit: 21,324,533,699 RAC: 3,364,777

Completed tasks: 1487105
Credit: 54,941,721.25
Primes found 167
Percentage of tests resulting with a prime 0.0112
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Completed tasks 209232
Credit 7,415,906.60
Primes found 30 (18 as initial finder)
Percentage of tests resulting with a prime 0.0143
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Largest Primes to Date:
As Double Checker: SR5 109208*5^1816285+1 Dgts1,269,534
As Initial Finder: SR5 243944*5^12585761 Dgts879,713




Completed tasks : 654
Credit: 26143
Primes: 1 (initial)
Percentage: 0.1529



Dave Send message
Joined: 13 Feb 12 Posts: 2765 ID: 130544 Credit: 919,293,227 RAC: 24,213

Well done :)!
Now print it out & frame it. In decimal form. 



Completed tasks: 1487105
Credit: 54,941,721.25
Primes found 167
Percentage of tests resulting with a prime 0.0112
We have a very similar hit rate:
Completed tasks 45010
Credit 1,796,707.78
Primes found 5
Percentage of tests resulting with a prime 0.0111
For me to match your current credit, I would need over 4 years of nonstop SGS crunching. Disgusting! :) 



I was lucky enough well done to my slow pc :) 


CrunchiVolunteer tester
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Joined: 25 Nov 09 Posts: 2941 ID: 50683 Credit: 56,510,917 RAC: 720

I was lucky enough well done to my slow pc :)
Some have lucky, some have fast CPU :)
In both cases congratulations!
____________
314187728^^{131072}+1 GENERALIZED FERMAT :)
93*10^^{1029523}1 REPDIGIT PRIME
31*332^^{367560}+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie! 



Metin Sariyar wrote: Completed tasks : 654
Credit: 26143
Primes: 1 (initial)
Percentage: 0.1529
Congratulations !
Metin Sariyar wrote: I was lucky enough well done to my slow pc :)
Indeed.
I'm still searching
Completed tasks 15456
Credit 616,903.66
Primes found 0 



Metin Sariyar wrote: Completed tasks : 654
Credit: 26143
Primes: 1 (initial)
Percentage: 0.1529
Congratulations !
Metin Sariyar wrote: I was lucky enough well done to my slow pc :)
Indeed.
I'm still searching
Completed tasks 15456
Credit 616,903.66
Primes found 0
Wow thats also hard to achieve same probabilities working for every situation :) 


Dave Send message
Joined: 13 Feb 12 Posts: 2765 ID: 130544 Credit: 919,293,227 RAC: 24,213

It took me 29144 units & 1,163,226.39 credit to find my first SGS prime on 21 Feb 2015. 


GDBSend message
Joined: 15 Nov 11 Posts: 209 ID: 119185 Credit: 2,428,697,008 RAC: 898,775

It took me 29144 units & 1,163,226.39 credit to find my first SGS prime on 21 Feb 2015.
Technically, you didn't find an SGS prime. If you had found an SGS prime, it would be major worldwide news. What you did find was a common, everyday, ordinary prime during SGS prime search. We might have a million or more of these common primes, before we find a new actual SGS prime. 



It took me 29144 units & 1,163,226.39 credit to find my first SGS prime on 21 Feb 2015.
Technically, you didn't find an SGS prime. If you had found an SGS prime, it would be major worldwide news. What you did find was a common, everyday, ordinary prime during SGS prime search. We might have a million or more of these common primes, before we find a new actual SGS prime.
Yep, the prime I found just a prime of the form n*2^x1 :)
2*(n*2^x1)+1 must also be a prime to find a sgs prime thats why I run sgs with the hope to find such a prime :) 


Dave Send message
Joined: 13 Feb 12 Posts: 2765 ID: 130544 Credit: 919,293,227 RAC: 24,213

Ok. You know what I meant anyway. 


mackerelVolunteer tester
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Joined: 2 Oct 08 Posts: 2396 ID: 29980 Credit: 411,470,142 RAC: 23,105

I think it ok to say SGS prime for "normal" primes found in the project, the last S being for Search and SGS referring to the project. However, it wasn't a SG prime. 



I agree , anyway it is hard enough even to catch a normal prime , it is a dream to find a SG. So we should be happy with primes we found under SGS project. Little or big I like all primes are great :)
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3909127223745*2^12900001 is prime!
126055746^32768+1 is prime!
175894284^16384+1 is prime! (Private gfn server)
127511188^8192+1 is prime! (Private gfn server) 



Completed tasks 3120
Credit 124,570.16
Primes found 1
Percentage of tests resulting with a prime 0.0321
Just found my first SG prime this afternoon. Is a nice project to run before long challenges like GFN21 coming up. 


dukebgVolunteer tester
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Joined: 21 Nov 17 Posts: 238 ID: 950482 Credit: 23,170,125 RAC: 0

As discussed in messages above, it's better to call it "SGS prime", not "SG prime" as it's not actually a Sophie Germain pair of primes. 

