20060425, 06:26  #1 
Apprentice Crank
Mar 2006
2·227 Posts 
Project instructions
Gribozavr has sieved range 100M25G, so I've revised this thread.
Instructions: 1.) Download LLR from http://www.mersenne.org/gimps/ (choose llr370.zip) 2.) The n is fixed at 195000, and the base is 2. Choose any range of k. However, post your chosen range in this thread before starting on it, and choose the lowest range of k available (see "pre sieved range reservation thread). The ranges can be as large or as small as you want. 3.) Download your range (on the pre sieved range reservation thread). Move that file to the folder where LLR is in. Run the program, which will do the rest. 4.) After your range is complete, check LLR's output file to see whether you've found any primes. Post any primes in the "primes found" thread, even if they are not twin primes. If you need additional help, feel free to post here. 5.) If you find a twin prime, PM me and email Chris Caldwell (He's the creator of the prime pages. See http://primes.utm.edu/ and scroll to the bottom for his email). Do NOT inform anyone else yet. The reason for this is that I don't want someone else seeing that ?*2^1950001 and ?*2^195000+1 are twin primes. That person may just submit it by himself to the prime pages, which means that he/she gets the credit. The actual person who found the prime and the project won't get any credit Good luck! Last fiddled with by MooooMoo on 20061217 at 00:28 
20060425, 06:46  #2 
Apprentice Crank
Mar 2006
2·227 Posts 
Oops, I forgot to mention that you should make LLR's output file different from its input file. Also, if the output file is larger than 30 bytes, there's a good chance that you found a prime or two. However, it is possible (and has happened before) for the output file to be smaller than 30 bytes, and still contain at least one prime.
Last fiddled with by MooooMoo on 20060514 at 07:13 
20060503, 01:17  #3 
"Jason Goatcher"
Mar 2005
5×701 Posts 
100,000 to 100,000,000,000 reserved
I'm just sieving and I'm not sure how fast the twin option will sieve them out. I may change my reservation in a couple hours. Sorry if I'm annoying anyone. 
20060503, 03:12  #4  
Apprentice Crank
Mar 2006
2·227 Posts 
Quote:
It's not entirely your fault for choosing that range, though. My first post in this thread said "currently, all ranges above 100,000 are available". I wanted to edit this many times before, but the site doesn't allow me to edit after 15 minutes. Therefore, you'll have to check the "range reservations thread" for updates. 

20060503, 09:20  #5  
Oct 2003
Croatia
2^{3}·3·19 Posts 
Quote:
Edo 

20060503, 10:44  #6 
Mar 2004
3×127 Posts 
Sieving does not need primetest reserve.
If we sieve a large range, I recommen also to include the low n part (for example (3 to 20G). The sieving of a 20G range speed is almost the same as 5G. Without knowing your efforts I tried also a bit sieving on 3  10G up to 10T with a speed of 80M/s or 6.5T/day (P4 3.4GHz). At 10T, there are ~4.6M candidates left which is about 85M text file or 16.5MByte Zipped. Removing 3 candidtes /s at 10T. when sieving 20G reching 50T (1 Week sieving), such a file (twice as big) could be distributed, sieved more and then merged again. I people run prime tests on a range of 100M or less, it already makes more sense to take the presieved ranges insted of own sieving. 
20060503, 14:49  #7 
Oct 2005
Italy
3×113 Posts 
MooMoooo can you store somewhere the primes found ? In the site I trace only the NUMBER OF PRIMES FOUND.
Of course if we find any twins, I publish them. 
20060503, 23:48  #8  
Apprentice Crank
Mar 2006
2×227 Posts 
Quote:
 edorajh, I've requested to be a moderator on the "forum feedback" forum, so all threads will be updated. Hopefully, there won't be any more range confusion. 

20060606, 12:28  #9 
Jun 2003
2^{2}·61 Posts 
i downloaded a presieved range and started running it in LLR, however I noticed that it is only testing k*2^n  1 candidates, it isnt doing the +1. am i misunderstanding the intentions of this project or am i just doing something wrong?

20060606, 13:30  #10 
Nov 2004
California
2^{3}×3×71 Posts 
It only needs to check the +1 candidate when it finds a prime in
the 1 candidate. That will miss primes of the form k2^n+1, but is faster towards the goal of a twin prime (both +1 and 1 prime). 
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