Riesel base 16 - team drive #2 - Page 14

mdettweiler · 2010-03-10, 16:14

Quote:

Originally Posted by antiroach

Hey I'm new to this, but i'd like to reserve 210-212k. I'm using LLR 3.7.1c (windows). Is this the version I should be using or is there a newer version or a better program to do prp tests on these numbers? Thanks!

I'd use LLR 3.8.0--it's about 6-10% faster for these numbers. You can get it from the same place you get 3.7.1c:
http://jpenne.free.fr/index2.html

antiroach · 2010-03-10, 16:15

Cool thanks, ill grab that version.

antiroach · 2010-03-18, 13:02

Hey after a couple of days i've found a prime:
2993*2^844644-1 is prime! Time : 1625.153 sec.

Does this mean i can remove all remaining entries with k=2993 in the remainder of the file that i'm prp'ing?

Mini-Geek · 2010-03-18, 16:41

Quote:

Originally Posted by antiroach

Hey after a couple of days i've found a prime:
2993*2^844644-1 is prime! Time : 1625.153 sec.

Congratulations! I see you've already submitted it to the Top 5000 list, but there's a problem with how you credited it. You credited LLR, but not CRUS and srsieve, as this page instructs you to:
http://www.mersenneforum.org/showthread.php?t=9782
I think that to fix it, you'll have to email caldwell@utm.edu informing him of the needed change.

Quote:

Originally Posted by antiroach

Does this mean i can remove all remaining entries with k=2993 in the remainder of the file that i'm prp'ing?

Correct. All larger candidates with that k do not need to be tested. You can remove them from the file to save time, or you can leave them in the file to avoid the trouble of removing it and have an ever-so-slightly higher chance of finding another huge prime in your range. Up to you.

MyDogBuster · 2010-03-18, 16:53

Quote:

Hey after a couple of days i've found a prime:
2993*2^844644-1 is prime! Time : 1625.153 sec.

Nice one.

That leaves just 25k's to go.

mdettweiler · 2010-03-18, 16:57

Quote:

Originally Posted by antiroach

Hey after a couple of days i've found a prime:
2993*2^844644-1 is prime! Time : 1625.153 sec.

Does this mean i can remove all remaining entries with k=2993 in the remainder of the file that i'm prp'ing?

Yep, you got it. However, for ranges like this where the primes are in top-5000 territory, and you're using LLR for testing (which doesn't remove k's automatically in this type of situation like PFGW does--we use PFGW for other drives for this reason but it's not ideal for base 16 because it produces incompatible residues), some people prefer to just leave such k's in until the end of the range, especially if they're not far from the end. The idea is that they might just pick up a "bonus" prime on that same k farther along in the range (which is not particularly useful for CRUS, but still interesting as a curiosity). In fact that happened to Gary once a while back--he found a prime, left in the k, and found another prime on it afterwards.

But, it's your call. I personally prefer to remove such k's most of the time since I've always been one to "pinch CPU cycles", but sometimes will leave them in if it's too much hassle. Either way is fine as far as the project goes.

BTW, speaking of this prime: did you report it to the top-5000 list website? If you're not familiar with the process, someone here can give instructions. (If you've done this before, the proof code you'd need to use is "[your name], CRUS, LLR, Srsieve".)

Edit: Ah, I see Mini-Geek beat me to the punch while I was writing this post.

antiroach · 2010-03-18, 17:05

Thanks for the info guys. I've emailed Chris Caldwell and requested he modify the proof-code accordingly.

I've also removed the other entries with k=2993 to speed up the conjecture proving process :0

gd_barnes · 2010-03-18, 17:24

Quote:

Originally Posted by antiroach

Thanks for the info guys. I've emailed Chris Caldwell and requested he modify the proof-code accordingly.

I've also removed the other entries with k=2993 to speed up the conjecture proving process :0

Congrats on a quick and large prime!

Prof. Caldwell will probably ask you to create a new proof code yourself that credits the correct project/software. He'll then transfer the prime over to it. After the transfer, the incorrect proof code will then "delete itself" after more than 24 hours without any reported primes.

gd_barnes · 2010-03-18, 17:28

Quote:

Originally Posted by MyDogBuster

Nice one.

That leaves just 25k's to go.

This is the Riesel side so it leaves 22 k's remaining. There are 26 k's remaining on the Sierp side.

mdettweiler · 2010-03-18, 18:22

You know, I've gotta say...with all these primes we've been having lately on the bases 16, the huge primeless gaps in both of them (~140K-195K on the Sierp. side, and ~100K-200K with sporadic exceptions on the Riesel side) are looking more and more suspect. I'm beginning to wonder if some doublechecking isn't in order. With newer, faster machines more widely disseminated now, I imagine we could get through those respective ranges in reasonably short order if we had a total of 2-4 quads working on them.

Any thoughts on this? I think there's a reasonably decent chance of finding an additional prime or two on one or both of these drives. Much of the primeless gaps were done in rather large contiguous chunks by a few people, enough so that just one bad machine could have caused a lot of damage.

MyDogBuster · 2010-03-18, 18:47

Quote:

This is the Riesel side so it leaves 22 k's remaining. There are 26 k's remaining on the Sierp side.

That cinches it. Time for new glasses, or maybe I should just wear the ones I'm supposed to wear. LOL

2010-03-18, 17:05	#150
antiroach Jun 2003 2²·61 Posts	Thanks for the info guys. I've emailed Chris Caldwell and requested he modify the proof-code accordingly. I've also removed the other entries with k=2993 to speed up the conjecture proving process :0 Last fiddled with by antiroach on 2010-03-18 at 17:05

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Riesel base 6 - team drive #4 - EIGHT OR BUST!	gd_barnes	Conjectures 'R Us	401	2015-05-27 15:15
Sierp base 63 - team drive #5	rogue	Conjectures 'R Us	146	2011-04-20 05:12
Sieving drive Riesel base 6 n=1M-2M	gd_barnes	Conjectures 'R Us	40	2011-01-22 08:10
Sieving drive Riesel base 6 n=150K-1M	gd_barnes	Conjectures 'R Us	27	2009-10-08 21:49
Riesel base 3 - mini-drive I	gd_barnes	Conjectures 'R Us	199	2009-09-30 18:44

2010-03-10, 16:15	#145
antiroach Jun 2003 2²×61 Posts	Cool thanks, ill grab that version.

2010-03-18, 13:02	#146
antiroach Jun 2003 2²×61 Posts	Hey after a couple of days i've found a prime: 2993*2^844644-1 is prime! Time : 1625.153 sec. Does this mean i can remove all remaining entries with k=2993 in the remainder of the file that i'm prp'ing?

2010-03-18, 18:22	#153
mdettweiler A Sunny Moo Aug 2007 USA (GMT-5) 3·2,083 Posts	You know, I've gotta say...with all these primes we've been having lately on the bases 16, the huge primeless gaps in both of them (~140K-195K on the Sierp. side, and ~100K-200K with sporadic exceptions on the Riesel side) are looking more and more suspect. I'm beginning to wonder if some doublechecking isn't in order. With newer, faster machines more widely disseminated now, I imagine we could get through those respective ranges in reasonably short order if we had a total of 2-4 quads working on them. Any thoughts on this? I think there's a reasonably decent chance of finding an additional prime or two on one or both of these drives. Much of the primeless gaps were done in rather large contiguous chunks by a few people, enough so that just one bad machine could have caused a lot of damage.