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Message boards : Sophie Germain Prime Search : First prime (the 2nd)

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Bur
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Joined: 25 Feb 20
Posts: 30
ID: 1241833
Credit: 4,123,193
RAC: 31,212
ESP LLR Gold: Earned 500,000 credits (636,842)PPS LLR Silver: Earned 100,000 credits (362,309)SR5 LLR Gold: Earned 500,000 credits (531,145)SGS LLR Silver: Earned 100,000 credits (488,901)321 Sieve Ruby: Earned 2,000,000 credits (2,105,323)
Message 140587 - Posted: 3 Jun 2020 | 18:01:44 UTC
Last modified: 3 Jun 2020 | 18:02:54 UTC

I couldn't reply in the old thread, probably due to it being old. So here's a new one.

After just 7000 WUs I noticed a task taking close to 4000 s and after a few hours received a mail saying I found a prime. Something like 350,000 digits, so noting special, but since it's the frist I found, I was somewhat excited. :D

I have a question though, were the tests for twin prime and SG prime already done? Or will that be a seperate WU? In other words, can I keep my fingers crossed?


And maybe it's of use to some others, I was tracking the probability for finding a prime. This can be done by p = 1-(1-1/x)^n where x is the number of WUs it takes to find a prime (you can get this from the stats page, right now it's something like x = 14450 for SGS) and n is the number of tasks one has processed so far.

So finding one after only 7000 tasks has a 39% chance, combined with me finishing 1st only in about 45% of all WUs, this had a 17% chance to happen so soon. So even if it's not a special prime, I'm still feeling lucky. ;)

Profile JeppeSNProject donor
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Joined: 5 Apr 14
Posts: 1148
ID: 306875
Credit: 14,561,322
RAC: 20,949
Found 1 prime in the 2020 Tour de Primes321 LLR Silver: Earned 100,000 credits (360,928)Cullen LLR Bronze: Earned 10,000 credits (98,851)ESP LLR Silver: Earned 100,000 credits (139,922)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (35,236)PPS LLR Turquoise: Earned 5,000,000 credits (5,261,213)PSP LLR Silver: Earned 100,000 credits (212,242)SoB LLR Silver: Earned 100,000 credits (237,390)SR5 LLR Silver: Earned 100,000 credits (145,419)SGS LLR Bronze: Earned 10,000 credits (99,305)TRP LLR Bronze: Earned 10,000 credits (71,060)Woodall LLR Silver: Earned 100,000 credits (109,455)321 Sieve Silver: Earned 100,000 credits (175,037)PSA Turquoise: Earned 5,000,000 credits (7,614,290)
Message 140588 - Posted: 3 Jun 2020 | 18:12:52 UTC

No need to keep fingers crossed. The prime shows up on your account (when I click your name here in the forum) already, so it does not have any "companion".

The fact that it has no twin was established by your own work, which is why this task took longer than ordinary tasks in this project.

The fact that it is not Sophie Germain (or safe, although the current sieve does not give a good chance for safe primes) was established by the server already.

Congratulations with your prime.

/JeppeSN

Profile Eudy SilvaProject donor
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Joined: 26 Aug 17
Posts: 1149
ID: 918937
Credit: 169,782,681
RAC: 350,307
Discovered 1 mega primeFound 2 primes in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de Primes321 LLR Amethyst: Earned 1,000,000 credits (1,012,503)Cullen LLR Amethyst: Earned 1,000,000 credits (1,011,118)ESP LLR Amethyst: Earned 1,000,000 credits (1,022,307)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,004,746)PPS LLR Jade: Earned 10,000,000 credits (10,876,995)PSP LLR Amethyst: Earned 1,000,000 credits (1,123,300)SoB LLR Ruby: Earned 2,000,000 credits (2,113,239)SR5 LLR Ruby: Earned 2,000,000 credits (2,947,019)SGS LLR Amethyst: Earned 1,000,000 credits (1,462,951)TRP LLR Amethyst: Earned 1,000,000 credits (1,309,179)Woodall LLR Amethyst: Earned 1,000,000 credits (1,001,901)321 Sieve Amethyst: Earned 1,000,000 credits (1,119,749)Generalized Cullen/Woodall Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,005,331)PPS Sieve Emerald: Earned 50,000,000 credits (68,687,496)AP 26/27 Sapphire: Earned 20,000,000 credits (24,326,731)GFN Sapphire: Earned 20,000,000 credits (47,698,894)PSA Ruby: Earned 2,000,000 credits (2,059,222)
Message 140590 - Posted: 3 Jun 2020 | 19:03:46 UTC

Congrats, Bur !
____________
"Accidit in puncto, quod non contingit in anno."
Something that does not occur in a year may, perchance, happen in a moment.

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Message boards : Sophie Germain Prime Search : First prime (the 2nd)

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