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 2007-12-21, 07:17 #23 em99010pepe     Sep 2004 283010 Posts When I free up some machines (7 cores, 1 already working) I'll put them on here to give you guys a little boost....
2007-12-21, 08:33   #24
gd_barnes

May 2007
Kansas; USA

13×853 Posts

Quote:
 Originally Posted by Citrix Gary, Could we have a separate webpage for powers of 2. I think these will be the most popular. By the way the webpage looks really nice.
Quote:
 Originally Posted by Siemelink Hi Gary, All your coordination effort is really nice. I checked out the webpages, they are solid stuff. I just had one minor thought, is it possible to keep the headers of the table in view when scrolling down? Laters, Willem
A follow-up on these requests. After thinking about the powers of 2 request, I think it as well as the headers request are good ideas. I'm a bit of a newb at HTML and it is very strange attempting to keep the headers on when scrolling down. After getting a response from Karsten (Kar_bon) on how to do that, I should be able to do it. I'll work on both of these later this weekend.

FYI, I've analyzed powers of 2 up to 256 now. The conjectures on base 64 are low at k=14 and k=51 and were easily proven. On base 128, they're low with both at k=44 but I wasn't able to quite prove them. Riesel had one k remaining at n=5K. Sierp had 4 k's remaining at n=40K (searched to n=5K and converted higher ones from base 2) but 3 of them cannot be proven for the same reason as k=4 on Sierp base 32. So no good for those.

I think that base 256 may be the next power of 2 effort after bases 4 and 16. It has a Riesel conjecture of k=10364 and a Sierp conjecture of k=1221. Sierp's is a little low but Riesel may yield some k's to search very high. Ultimately I'll check it to base 1024 or possibly 4096 but I see no reason to go any higher. There may not be any that are good > base 256.

Based on almost split poll results, I think it may make sense to simultaneously do some powers of 2 while continuing to fill in bases <= 32.

Although there isn't a separate page for powers of 2 yet, I will add base 64 in just a little while and add base 128 later today (Friday) on the current pages.

If you haven't voted on the direction of the effort yet, get your voice heard! It is the poll in this forum. It's not public so I have no idea how people vote.

Gary

2007-12-21, 08:42   #25
gd_barnes

May 2007
Kansas; USA

13×853 Posts

Quote:
 Originally Posted by em99010pepe When I free up some machines (7 cores, 1 already working) I'll put them on here to give you guys a little boost....
Hah! A LITTLE boost! Everyone, with a couple of new quads running 50% faster than anything I have, this guy eats sieved files for lunch and dinner too!

I'll see if I can get some sieving going on for ~45-50 of the base 16 k's this weekend as the beginning of a team effort. I want to save a few for individual efforts. I think he said it'd be ~2 weeks before the other cores free up.

Gary

2007-12-21, 14:48   #26

Sep 2004
UVic

10001102 Posts

Quote:
 Originally Posted by gd_barnes Great, we'll reserve it for you. And thanks for sharing your sieved file. I know of a person who might want to work on it for a little while. Would you be OK with that or is your break from it temporary? Since it's officially the 'Sierpinski Base 4' project, I would inform him to report it as such if he found a prime. ... Edit: You may want to post your break from Sierp Base 4 in that thread also. Alternatively if you and Jean Penne prefer to abandon that thread and report statuses here, that works for us and saves me from having to check it occassionally. If you both agree, I'll just have Citrix lock the thread after a period of time. Gary
let'em have at it! I'd be more interested in seeing it fall to finding a prime than selfishly holding onto it.

as for the thread closure...I'm fine either way. I'd just want to make sure that the files don't get lost along the way. I think there's relatively recent newpgen's for all k's and even 2 different dats attached throughout the thread (1 for original search, 1 for expanded search)

2007-12-21, 21:27   #27
gd_barnes

May 2007
Kansas; USA

2B5116 Posts
Releasing Sierp base 11 and Sierp base 23

I have completed testing the one k remaining on Sierp base 11 to n=100K and the two k's remaining on Sierp base 23 to n=60K. They are now released for testing.

Carlos, Willem, or whomever wants to test Sierp base 23 further, I'm attaching the remainder of my sieved file up to n=100K to this post. It's well sieved to P=600G.

Gary
Attached Files
 sieve-sierp-base23-060K-100K.txt (10.8 KB, 418 views)

2007-12-21, 22:44   #28

Jan 2006
Hungary

22·67 Posts

Quote:
 Originally Posted by gd_barnes I have completed testing the one k remaining on Sierp base 11 to n=100K and the two k's remaining on Sierp base 23 to n=60K. They are now released for testing. Carlos, Willem, or whomever wants to test Sierp base 23 further, I'm attaching the remainder of my sieved file up to n=100K to this post. It's well sieved to P=600G. Gary
Yeah, that's for me. I started it yesterday already at 60k. I am now off for the holidays so I wonder what I'll find when I return.

Laters, Willem.

2007-12-21, 23:57   #29
gd_barnes

May 2007
Kansas; USA

2B5116 Posts

Quote:
 Originally Posted by Siemelink Yeah, that's for me. I started it yesterday already at 60k. I am now off for the holidays so I wonder what I'll find when I return. Laters, Willem.

Very good. Got ya down. Maybe you'll find a top-5000 prime when you return! n>=73.7K would do it for base 23.

Note for everyone: As you probably well know, this is not an official prime-search project so any top-5000 prime correctly reported should not include a project ID.

Gary

 2007-12-22, 07:33 #30 sjtjung     Mar 2006 Columbus, OH 7×11 Posts I would like to reserve 706 for base 27 to at least n= 50k. I might continue working on it. -Steven
 2007-12-23, 19:19 #31 tcadigan     Sep 2004 UVic 2·5·7 Posts 7773*2^199784+1 is prime! Time: 213.884 sec. i.e. 7773*16^49946+1 60145 digits I'll try my 6663 to 100K next Last fiddled with by gd_barnes on 2010-05-16 at 07:12
2007-12-24, 03:14   #32
gd_barnes

May 2007
Kansas; USA

255218 Posts

Quote:
 Originally Posted by sjtjung I would like to reserve 706 for base 27 to at least n= 50k. I might continue working on it. -Steven
Great! Got you down.

Quote:
 Originally Posted by tcadigan 7773*2^199784+1 is prime! Time: 213.884 sec. i.e. 7773*16^49946+1 60145 digits I'll try my 6663 to 100K next

Good find. Our first n > 25K for the effort! 56 k's to go base 16.

Edit: I tried moving these into the new 'report primes here' thread that I just now created but it put them before the main post since they were written earlier. So I'll just leave them here. Please report all future primes in that thread...sorry that it wasn't created earlier.

Gary

Last fiddled with by gd_barnes on 2007-12-24 at 03:53

2007-12-24, 15:44   #33
michaf

Jan 2005

479 Posts

I think I forgot to report here, it's close to being done to n=10000 now

Quote:
 Originally Posted by michaf I'm running Sierpinski base 24 upto n=5000 now. I'll report here when it's done

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