# Thread: Sierpinski/Riesel Base 5 Project

1. ## Sierpinski/Riesel Base 5 Project

"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/

LLRNET- Client (windows only)

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

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
Now is up to Bok to make some fine stats and create a special Free-DC Forum.

Cheers,

Carlos

2. sr5sieve version 1.2.3 is out here.

3. sr5sieve version 1.2.6 is out here.

4. LLRNET linux client is now available here:

http://base5.greenbank.org/

5. sr5sieve version 1.3.0 is out here.

6. sr5sieve version 1.3.1 is out here.

7. it's even 1.3.2 now ... this build remember the number of factors of the actual range

8. sr5sieve version 1.3.4 is out here.

9. 1.4.39 is out now here

10. oh well sr5sieve 1.7.10 avail in a sameplace

11. sr5sieve-1.8.10 sieve program available here.

SR5data sieve file available here:
http://mersenneforum.org/base5/sr5data.txt.bz2

http://mersenneforum.org/base5/sr5data.txt.gz

http://mersenneforum.org/base5/sr5data.txt.zip

Three different compressions, one file.[/QUOTE]

12. ## Four more primes contest! Started!

We need to find four more primes to make this the best year in the project. To see the number of primes found by year, look at the Primes Reported paragraph of the Description post. This is also a good place to find out more about the project.

Using PrimeScoring the years shape up like this:
Code:
```2006	9319511
2010	8390964
2007	4763138
2005	3301224
2008	1907691
2004	386550```
For more information about the contest please see this thread.

13. ## Planned Shutdown 2010-12-15 for four days

For more information see this post.

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