mersenneforum.org GAPS BETWEEN PRIME PAIRS (Twin Primes)
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2020-05-14, 18:57   #199
mart_r

Dec 2008
you know...around...

11008 Posts

Quote:
 Originally Posted by Bobby Jacobs Hey! Why are you reserving an infinite range? You should be generous and only reserve a finite range.
Do you want to join the search? If you say pretty please with cherry icing on top, I may, well I might consider being so generous as to share a teeny weeny bit of the range.
(Also kinda reminds me of an episode of "Angelo Rules" where Sherwood wanted to go swimming only because he was not allowed to.)

Actually I thought it would be less work for me as well as for the mods if I continue for as long as I don't plan to stop until someone else wants to join in instead of having to reserve new ranges every then and again. Prime gaps searches don't seem to be very popular these days.

2020-05-17, 11:27   #200
robert44444uk

Jun 2003
Oxford, UK

75316 Posts

Quote:
 Originally Posted by mart_r Do you want to join the search? If you say pretty please with cherry icing on top, I may, well I might consider being so generous as to share a teeny weeny bit of the range. (Also kinda reminds me of an episode of "Angelo Rules" where Sherwood wanted to go swimming only because he was not allowed to.) Actually I thought it would be less work for me as well as for the mods if I continue for as long as I don't plan to stop until someone else wants to join in instead of having to reserve new ranges every then and again. Prime gaps searches don't seem to be very popular these days.
It is a good job you did not reserve to infinity and beyond

To be fair (and slightly more precise), prime gap search posts on Mersenneforum do not appear to be very popular these days. I'm still looking, and I have almost 1,000 record small gaps to post, but I just don't have time to contribute to discussions at the moment.

2020-05-24, 14:41   #201
Bobby Jacobs

May 2018

26×3 Posts

Quote:
 Originally Posted by mart_r Do you want to join the search? If you say pretty please with cherry icing on top, I may, well I might consider being so generous as to share a teeny weeny bit of the range. (Also kinda reminds me of an episode of "Angelo Rules" where Sherwood wanted to go swimming only because he was not allowed to.) Actually I thought it would be less work for me as well as for the mods if I continue for as long as I don't plan to stop until someone else wants to join in instead of having to reserve new ranges every then and again. Prime gaps searches don't seem to be very popular these days.
Then, I will reserve 9.9e15 to 1e16 please. Where is the code to run? Thank you.

2020-05-24, 15:17   #202
mart_r

Dec 2008
you know...around...

26·32 Posts

Quote:
 Originally Posted by Bobby Jacobs Then, I will reserve 9.9e15 to 1e16 please. Where is the code to run? Thank you.
I'm currently in the 9.4e15 area, so that's ok

I use Thomas's code from post # 145 here:
https://www.mersenneforum.org/showpo...&postcount=145

 2020-06-28, 21:10 #203 Bobby Jacobs     May 2018 26×3 Posts What line do I type in the terminal to run the twin prime gap code? Are there any extra binaries I need to have?
2020-06-29, 08:51   #204
mart_r

Dec 2008
you know...around...

11008 Posts

Quote:
 Originally Posted by Bobby Jacobs What line do I type in the terminal to run the twin prime gap code? Are there any extra binaries I need to have?
After you unzipped the folder - mine is under "C:\Program Files\twingaps" - your command input looks like this:

Code:
C:\Users> cd..
C:\> cd Program Files\twingaps
C:\Program Files\twingaps> twingaps.exe -k1 99e14 -k2 1e16 -mingap 4000 >> output.txt
You will only see the outputs in the text file in that folder.
If the program is interrupted, to continue you would have to set the value for -k1 to the most recent value in the output file.

My fastest PC searches 6.9e7 k's per second per core, and I would normally distribute the work on four cores, with the first interval being -k1 99e14 -k2 9925e12 and so on.

2020-07-26, 20:19   #205
mart_r

Dec 2008
you know...around...

26·32 Posts

I'm releasing most of my reservation and going back to reserving only a finite range.
To keep this project alive, here's the 411:

Stats for k < 9.9e15 in the attachment.

Reservations:
Bobby Jacobs: 9.9e15 to 1e16
firejuggler: 1e16 to 1.05e16
mart_r: 1.05e16 to 1.1e16
Attached Files
 twingaps up to 9.9e15.txt (305.3 KB, 20 views)

 2020-08-09, 19:50 #206 Bobby Jacobs     May 2018 26·3 Posts The program does not seem to work on my computer. Therefore, I will withdraw my range.
 2020-08-17, 14:29 #207 MightyPawn   Aug 2020 11 Posts i took a different aproach to this a few years ago starting off lookin at 6n+1 and 6n+5 is a nice way to start your prime search. did you know you can expand it??? take your candidate mod 30 and you only have 8 answers that can be prime. 1, 7,11, 13, 17, 19, 23, and 29 next... since there are only 8 places... you can turn the result into binary and then combine two bytes into Hex form (FF) and save your data in a very minimal form. Then, say you want to find pairs of twins (like 11, 13, 17, 19) all you need to is loop thru your data using a logical AND function. Ie Data AND "3C" I have already created such a table containing all primes upto around 1.5 Billion. I am happy to share.
2020-08-17, 14:45   #208
CRGreathouse

Aug 2006

10111001000112 Posts

Quote:
 Originally Posted by MightyPawn starting off lookin at 6n+1 and 6n+5 is a nice way to start your prime search. did you know you can expand it??? take your candidate mod 30 and you only have 8 answers that can be prime. 1, 7,11, 13, 17, 19, 23, and 29 next... since there are only 8 places... you can turn the result into binary and then combine two bytes into Hex form (FF) and save your data in a very minimal form. Then, say you want to find pairs of twins (like 11, 13, 17, 19) all you need to is loop thru your data using a logical AND function. Ie Data AND "3C" I have already created such a table containing all primes upto around 1.5 Billion. I am happy to share.
This is a reasonable way to start a search, but the state-of-the-art has progressed much further. PARI/GP, which is by no means optimized for this purpose, can generate the primes up to 1.5 billion in 12 seconds. primesieve, which is (AFAIK) the world-leading software for this type of cfomputation.

 2020-08-17, 17:06 #209 firejuggler     Apr 2010 Over the rainbow 3·11·73 Posts I'll take bobby's range. (in fact I already did start it a few days ago). i'm at ~50 done with it. on my own assignement, I'm at 20% done.

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