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Thread: Sierpinski/Riesel Base 5 Project

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  1. #1
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    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. #2
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    sr5sieve version 1.2.3 is out here.

  3. #3
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    sr5sieve version 1.2.6 is out here.

  4. #4
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    LLRNET linux client is now available here:

    http://base5.greenbank.org/

  5. #5
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    sr5sieve version 1.3.0 is out here.

  6. #6
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    sr5sieve version 1.3.1 is out here.

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

  8. #8
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    sr5sieve version 1.3.4 is out here.

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