Sierpinski/Riesel Base 5 Project

[em99010pepe]

"New" math project available with teams and stats.

The goal is to look for the lowest Sierpinski and Riesel numbers in base 5.
Here's a quote:

he lowest even Reisel number is mooted to be 346802 and the lowest even Sierpinski 159986. That is to say 346802.5^n-1 is always composite for every n, and 159986.5^n+1 is similarly endowed.

The Sierpinskis look the easiest to look at. We have to show there is a prime for every even k (in the power series k.5^n+1) less than k=159986 and I have checked so far up to n=18468 for all of the remaining values of k shown below. All other values of k have a prime at less than n=18468

Robert Smith

Stats are available here (thanks Lars)

http://www.sr5.psp-project.de/

Sieve - Clients (windows, linux)

http://geocities.com/g_w_reynolds/sr5sieve/

(always look for the latest version)

LLRNET- Client (windows and linux)

http://base5.greenbank.org/

Project Forum

http://www.mersenneforum.org/forumdisplay.php?f=54

How to join or create a team?

Just post here.

How to run the LLRNET client?

http://www.mersenneforum.org/showthread.php?t=6270

Here you might find a bunch of primes. P4 only or fast AMD64.

How to run the sieve client?

Well, go here and reserve a sieve range. Then download the dat file from one of the following links:

http://base5.greenbank.org/
or
http://home.wanadoo.nl/michafleuren/...sierpinski.htm

Create a sr5work.txt and to sieve the range 50 billion to 55 billion (i.e. 50e9 to 55e9), you add a single line in sr5work.txt like this

50,55

Then start the client like this:

start /min /low sr5sieve.exe

Cheers,

Carlos

[em99010pepe]

Since yesterday a new prime was found: 31342*5^102551-1 is prime!

Bunch there to be found (298), will XS join the hunting? At this level a number is tested within 13 min on an AMD 64 3000+.

Cheers,

Carlos

[em99010pepe]

Since my last post a few primes have been found. No one here wants to join the fun?

Carlos

[em99010pepe]

Hi all,

Everyone is invited to make a 24 hr run on PRP Riesel testing starting on 20/10/2006 at 9pm (Zulu time).

Free-DC members participating:
Helix
Free-DC Mercenaries
tnerual
edorajh

Last time we did one Helix found a prime!!!!

Carlos

[bullet2urbrain]

Thanks for the invite Carlos,

unfortunately XS Collegiate Mafia will not be particiapting in this hunt, the issue of registering a spectrum of numbers kind of makes this project difficult for me to stomach.

Thank you for your most gracious invite and Best of Luck in your hunt for Primes

[em99010pepe]

The project really needs a boost on PRP testing.
Please help by running the LLRNET client. Thanks.

Carlos

[em99010pepe]

At least 6 primes have been found since my last post, I even found one!!!!

Carlos