Riesel base 2 discussion

[ValerieVonck]

A riesel.dat file is uploaded to
http://users.skynet.be/bk261068/riesel.zip

It can be converted with RieselConvert to input files for LLR

[KEP]

Originally Posted by CedricVonck

A riesel.dat file is uploaded to
http://users.skynet.be/bk261068/riesel.zip

It can be converted with RieselConvert to input files for LLR

I really don't think that we should start up any of our own efforts on this conjecture, since PG is going to sieve for a while and then they will overtake whatever we can achieve when it comes to using LLR in maybe as little as 1-2 years. I know that if we focused on a highweight k or even 3 or 4 k's we might be able to stay ahead of PG untill we reaches n=20M, if we decide to focus all our resources on running only those 5 k's and do nothing else for an entire decade. Well that was my 2 cents, however "the morale of the story" (thank you Gary for letting me quote you on this one ), is that there can be too many hands and computers doing the same kind of job, and eventually end up waisting a LOT of resources that could be better spent, so my suggestion is that CRUS focuses on some other conjectures than Riesel Base 2 conjecture. Heck there is also plenty of work to do elsewhere

KEP

[gd_barnes]

Originally Posted by KEP

I really don't think that we should start up any of our own efforts on this conjecture, since PG is going to sieve for a while and then they will overtake whatever we can achieve when it comes to using LLR in maybe as little as 1-2 years. I know that if we focused on a highweight k or even 3 or 4 k's we might be able to stay ahead of PG untill we reaches n=20M, if we decide to focus all our resources on running only those 5 k's and do nothing else for an entire decade. Well that was my 2 cents, however "the morale of the story" (thank you Gary for letting me quote you on this one ), is that there can be too many hands and computers doing the same kind of job, and eventually end up waisting a LOT of resources that could be better spent, so my suggestion is that CRUS focuses on some other conjectures than Riesel Base 2 conjecture. Heck there is also plenty of work to do elsewhere

KEP

Agreed completely. It's PrimeGrid's to do with as they see fit now. We have plenty of work. If they want to sieve from scratch, then that's their perogative. It's just too bad that we'll end up with a 3-4 year streatch (inlcuding the last 1-2 years) where no primes at all will have been found because people were either too busy sieving way too deep or sieving a much larger range than should be sieved.

[wolfemancs]

Originally Posted by gd_barnes

Agreed completely. It's PrimeGrid's to do with as they see fit now. We have plenty of work. If they want to sieve from scratch, then that's their perogative. It's just too bad that we'll end up with a 3-4 year streatch (inlcuding the last 1-2 years) where no primes at all will have been found because people were either too busy sieving way too deep or sieving a much larger range than should be sieved.

Or maybe not (I looked around and didn't see this posted anywhere else here):

Current primegrid news post:

Originally Posted by primegrid.com

Mega Prime found for The Riesel Problem
On 21 Nov 2010, 11:14:00 UTC, PrimeGrid’s The Riesel Problem project eliminated k=191249 by finding the Mega prime: 191249*2^3417696-1

The prime is 1,028,835 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 29th overall. This is the 2nd largest prime found in The Riesel Problem and the first k elimination in over 2 1/2 years. 63 k's now remain.

The discovery was made by Jonathan Pritchard of the United Kingdom using an AMD Phenom 9950 with 8GB RAM, running Windows 7. This computer took 7 hours and 31 minutes to complete the prime test using LLR. Jonathan is a member of the Turan@BOINC team.

[gd_barnes]

Oh, sorry, I was 6 months off. It's been 2 years and 6 months since the last prime in June 2008.

[wolfemancs]

Heck of a month. Primegrid found primes for 4 more k values in May of 2011, bringing their total number of ks eliminated to 7.

Primes found at PrimeGrid

191249*2^3417696-1 by Jonathan Pritchard on 21 Nov 2010. Official Announcement
428639*2^3506452-1 by Brett Melvold on 14 Jan 2011. Official Announcement
65531*2^3629342-1 by Adrian Schori on 5 Apr 2011. Official Announcement
123547*2^3804809-1 by Jakub Łuszczek on 8 May 2011. Official Announcement
415267*2^3771929-1 by Alexey Tarasov on 8 May 2011. Official Announcement
141941*2^4299438-1 by Scott Brown on 26 May 2011. Official Announcement
353159*2^4331116-1 by Jaakko Reinman on 31 May 2011. Official Announcement

[gd_barnes]

Originally Posted by wolfemancs

Heck of a month. Primegrid found primes for 4 more k values in May of 2011, bringing their total number of ks eliminated to 7.

Primes found at PrimeGrid

191249*2^3417696-1 by Jonathan Pritchard on 21 Nov 2010. Official Announcement
428639*2^3506452-1 by Brett Melvold on 14 Jan 2011. Official Announcement
65531*2^3629342-1 by Adrian Schori on 5 Apr 2011. Official Announcement
123547*2^3804809-1 by Jakub Łuszczek on 8 May 2011. Official Announcement
415267*2^3771929-1 by Alexey Tarasov on 8 May 2011. Official Announcement
141941*2^4299438-1 by Scott Brown on 26 May 2011. Official Announcement
353159*2^4331116-1 by Jaakko Reinman on 31 May 2011. Official Announcement

An impressive haul. Congrats to PrimeGrid!

[kar_bon]

Originally Posted by wolfemancs

Heck of a month. Primegrid found primes for 4 more k values in May of 2011, bringing their total number of ks eliminated to 7.

As listed on my page here (and in the thread Riesel Prime Data Collecting (k*2^n-1), see News there) or on W.Keller's page here, too.