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1) Message boards : Sophie Germain Prime Search : First Prime! (Message 62150)
Posted 2214 days ago by Profile bglasgow
After about 3,000 work units I finally found one. From what I've read in other threads I feel pretty lucky. It still hasn't shown up on my primes pages, just the 'Your account' page, but I'm really excited to see it's decimal length once it's confirmed.


It will have ~ 388341 digits :)

Yes, you are pretty lucky, I search my SGS for more then 33.000 WU :)
And of course congratulations on your first prime!


Thanks for the info! But maybe I am misunderstanding the project goal, is this not a Sophie Germain? The digit count seems too high, doesn't it?


That's a very good question.

SGS searches for Sophie Germain pairs of prime numbers. The first step in finding a pair of primes is, as you might imagine, finding one prime. That's what you've found -- a Proth prime.

With SGS, once that prime is found, several other "adjacent" numbers are checked to see if they too are prime. If any of them are prime, then your prime and that prime together form a Sophie Germain pair (or a twin prime pair), and that's a pretty rare find.

For more details on exactly what constitutes a SG pair, please read the introductory post to this forum, located here.


Thanks for the explanation, that makes more sense. I come from a biology background, so my interest and knowledge of math is casual at best.

I had (incorrectly) assumed the SG search was searching the 2p + 1 form of previously discovered primes, and finding a prime in this project necessarily qualify it as Sophie Germain. Now that I think of it, those would be low-hanging fruits that would have already been tested.

2) Message boards : Sophie Germain Prime Search : First Prime! (Message 62146)
Posted 2214 days ago by Profile bglasgow
After about 3,000 work units I finally found one. From what I've read in other threads I feel pretty lucky. It still hasn't shown up on my primes pages, just the 'Your account' page, but I'm really excited to see it's decimal length once it's confirmed.


It will have ~ 388341 digits :)

Yes, you are pretty lucky, I search my SGS for more then 33.000 WU :)
And of course congratulations on your first prime!


Thanks for the info! But maybe I am misunderstanding the project goal, is this not a Sophie Germain? The digit count seems too high, doesn't it?
3) Message boards : Sophie Germain Prime Search : First Prime! (Message 62102)
Posted 2215 days ago by Profile bglasgow
After about 3,000 work units I finally found one. From what I've read in other threads I feel pretty lucky. It still hasn't shown up on my primes pages, just the 'Your account' page, but I'm really excited to see it's decimal length once it's confirmed.
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