Primes found - Page 13

Skligmund · 2007-02-13, 02:26

This is only done for the remote chance that somebody who looks around and tries to report visibal primes before the actual finder does. As for doublechecking a found prime, I believe it is there to make sure the prime isn't a twin. If a computer somehow errors the second half of the test, and it is a twin, who else is going to look? So that's why it is doublechecked. The unit will be sent out again by the server if a prime is found to make sure it isn't a twin. If it was already sent out twice for normal doublechecking, then we just have to wait for both results. first one to send it wins. lol

Ken_g6 · 2007-05-31, 03:03

Somewhere, either here or on the PrimeGrid board, I saw someone in authority say that if a doublechecked number turns out prime, *both* people will get credit for the prime.

Skligmund · 2007-05-31, 05:42

Only in PrimeGrid credits do both persons get credit for the prime. In other words, if you do a doublecheck of a prime, you will get 2.50 credits for it. However, you do not get to report the prime to the prime pages. also, you do not get the credit for finding the twin prime, should you be the one to doublecheck it. So don't confuse BOINC credits with prime reporting credits (2 seperate things here).

PrimeGrid will also add 1 prime found for your doublechecks on this page: http://www.primegrid.com/orig/top_prime.php

Ken_g6 · 2007-05-31, 15:03

Here we go: http://primegrid.com/orig/forum_thread.php?id=596

Skligmund · 2007-06-01, 04:57

Yup, just like I said. Only the originator of the prime gets to report it to the Prime Pages. Whayt he was complaining about was that the originator did not get an email (to report to the prime pages) for finding the prime.

qaz79 · 2007-06-03, 01:01

i found a prime.

7682205561*2^333333-1

qaz79 · 2007-06-03, 01:02

i found a prime.

7682205561*2^333333-1

MooooMoo · 2007-06-04, 19:19

qaz79,

I'll add the n=333,333 primes to the first post of this thread once they are too small for the top 5000 list. Until then, a complete list of primes found by TPS/PG can be found by clicking on "All of this project's primes" here (in case you didn't know):

http://primes.utm.edu/bios/page.php?id=949

or

http://primes.utm.edu/bios/page.php?id=950

biwema · 2008-08-24, 13:24

Range completed:

99900M-100000M biwema complete (7 primes)

99904218951*2^333333+1
99946436259*2^333333+1
99949817769*2^333333+1
99956002155*2^333333+1
99965117931*2^333333+1
99974141871*2^333333+1
99981453765*2^333333+1

no twins or (x)GFN...

How far did Primegrid already search? How many primes did they find in that range?

If PG completed about half of the range, it would still make sense to sieve a bit, even if the influence is not that high (besides the effort of removing the sieved candidates ftom the work-to-do lists).
If the range is double checked, even deeper sieve makes sense. Although it is inefficient to doublecheck twinprimesearch. Rather search a new range instead. There is enough available. (Or check +1 to find more primes and not to miss a twin). Although some double doublecheck (10%) could be useful to prevent cheating (getting credit with fake results)

MooooMoo · 2008-10-11, 23:28

Found a prime in my range, but it wasn't a twin:

99897184539*2^333333-1 is prime! Time : 265.494 sec.
99897184539*2^333333+1 is not prime. Proth RES64: 5B14B97C16198C92 Time: 266.068 sec.

Cybertronic · 2008-11-02, 09:35

Hello, I have used the same methode like my triplet search.

After 12h, I found the first :-)

73156402461*2^333333-1 is prime , +1 not

Interval : 73.15G - 73.16G , k's left 2068. Searching is abort.

With this methode it is possible to find 5 primes in a week , so I believe it.

2007-05-31, 15:03	#136
Ken_g6 Jan 2005 Caught in a sieve 5·79 Posts	Here we go: http://primegrid.com/orig/forum_thread.php?id=596 Last fiddled with by Ken_g6 on 2007-05-31 at 15:07

2008-08-24, 13:24	#141
biwema Mar 2004 3·127 Posts	Range completed: 99900M-100000M biwema complete (7 primes) 999042189512^333333+1 999464362592^333333+1 999498177692^333333+1 999560021552^333333+1 999651179312^333333+1 999741418712^333333+1 999814537652^333333+1 no twins or (x)GFN... How far did Primegrid already search? How many primes did they find in that range? If PG completed about half of the range, it would still make sense to sieve a bit, even if the influence is not that high (besides the effort of removing the sieved candidates ftom the work-to-do lists). If the range is double checked, even deeper sieve makes sense. Although it is inefficient to doublecheck twinprimesearch. Rather search a new range instead. There is enough available. (Or check +1 to find more primes and not to miss a twin). Although some double doublecheck (10%) could be useful to prevent cheating (getting credit with fake results) Last fiddled with by biwema on 2008-08-24 at 13:27 Reason: forgot the +1 in the prime list*

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2007-02-13, 02:26	#133
Skligmund Dec 2006 Anchorage, Alaska 2×3×13 Posts	This is only done for the remote chance that somebody who looks around and tries to report visibal primes before the actual finder does. As for doublechecking a found prime, I believe it is there to make sure the prime isn't a twin. If a computer somehow errors the second half of the test, and it is a twin, who else is going to look? So that's why it is doublechecked. The unit will be sent out again by the server if a prime is found to make sure it isn't a twin. If it was already sent out twice for normal doublechecking, then we just have to wait for both results. first one to send it wins. lol

2007-05-31, 03:03	#134
Ken_g6 Jan 2005 Caught in a sieve 5×79 Posts	Somewhere, either here or on the PrimeGrid board, I saw someone in authority say that if a doublechecked number turns out prime, both people will get credit for the prime.

2007-05-31, 05:42	#135
Skligmund Dec 2006 Anchorage, Alaska 78₁₀ Posts	Only in PrimeGrid credits do both persons get credit for the prime. In other words, if you do a doublecheck of a prime, you will get 2.50 credits for it. However, you do not get to report the prime to the prime pages. also, you do not get the credit for finding the twin prime, should you be the one to doublecheck it. So don't confuse BOINC credits with prime reporting credits (2 seperate things here). PrimeGrid will also add 1 prime found for your doublechecks on this page: http://www.primegrid.com/orig/top_prime.php

2007-06-01, 04:57	#137
Skligmund Dec 2006 Anchorage, Alaska 78₁₀ Posts	Yup, just like I said. Only the originator of the prime gets to report it to the Prime Pages. Whayt he was complaining about was that the originator did not get an email (to report to the prime pages) for finding the prime.

2007-06-03, 01:01	#138
qaz79 Jun 2007 2 Posts	i found a prime. 7682205561*2^333333-1

2007-06-03, 01:02	#139
qaz79 Jun 2007 2 Posts	i found a prime. 7682205561*2^333333-1

2007-06-04, 19:19	#140
MooooMoo Apprentice Crank Mar 2006 454₁₀ Posts	qaz79, I'll add the n=333,333 primes to the first post of this thread once they are too small for the top 5000 list. Until then, a complete list of primes found by TPS/PG can be found by clicking on "All of this project's primes" here (in case you didn't know): http://primes.utm.edu/bios/page.php?id=949 or http://primes.utm.edu/bios/page.php?id=950

2008-10-11, 23:28	#142
MooooMoo Apprentice Crank Mar 2006 2×227 Posts	Found a prime in my range, but it wasn't a twin: 998971845392^333333-1 is prime! Time : 265.494 sec. 998971845392^333333+1 is not prime. Proth RES64: 5B14B97C16198C92 Time: 266.068 sec.

2008-11-02, 09:35	#143
Cybertronic Jan 2007 Germany 3³·23 Posts	Hello, I have used the same methode like my triplet search. After 12h, I found the first :-) 73156402461*2^333333-1 is prime , +1 not Interval : 73.15G - 73.16G , k's left 2068. Searching is abort. With this methode it is possible to find 5 primes in a week , so I believe it.