KWSN Orbiting Fortress

John Galt 007 · Prince Joined: 31 Dec 2007 Posts: 1206 Location: Wisconsin

Welcome to the Autumnal Equinox Challenge

This year's autumnal equinox occurs on 23 September. Come join us as we usher in the fall and cooler temperatures with a 13 day marathon on the Woodall Prime Search project. To participate in the Challenge, please select only the Woodall Prime Search (LLR) project in your PrimeGrid preferences section. The challenge will begin 23 Sep 2011 18:00 UTC and end 06 Oct 2011 18:00 UTC. Application builds are available for Linux 32 bit, Windows 32 bit and MacIntel. These applications will be sent to 64 bit clients. As with all LLR application projects, there is no advantage of 64 bit over 32 bit.

ATTENTION: The primality program LLR is CPU intensive; so, it is vital to have a stable system with good cooling. It does not tolerate "even the slightest of errors." Please see this post for more details on how you can "stress test" your computer. WU's will take ~30-45 hours on fast/newer computers and 75+ hours. on slower/older computers. If your computer is highly overclocked, please consider "stress testing" it. Sieving is an excellent alternative for computers that are not able to LLR. Smile

Please, please, please make sure your machines are up to the task.

Time zone converter

The World Clock - Time Zone Converter

NOTE: The countdown clock on the front page uses the host computer time. Therefore, if your computer time is off, so will the countdown clock. For precise timing, use the UTC Time in the data section to the left of the countdown clock.

Scoring Information

Scores will be kept for individuals and teams. Only work units issued AFTER 23 Sep 2011 18:00 UTC and received BEFORE 06 Oct 2011 18:00 UTC will be considered for credit. We will use the "prime score" method which is based on the n value (k*b^n-1) to score the challenge. The only difference is that the primary and double checker of a WU will receive the same score.

Therefore, each completed WU will earn a unique score based on its n value. The higher the n, the higher the score. This is different than BOINC cobblestones! A quorum of 2 is NOT needed to award Challenge score - i.e. no double checker. Therefore, each returned result will earn a Challenge score. Please note that if the result is eventually declared invalid, the score will be removed.

For details on how the score is calculated, please see this thread.

At the Conclusion of the Challenge

We kindly ask users "moving on" to ABORT their WU's instead of DETACHING, RESETTING, or PAUSING.

ABORTING WU's allows them to be recycled immediately; thus a much faster "clean up" to the end of an LLR Challenge. DETACHING, RESETTING, and PAUSING WU's causes them to remain in limbo until they EXPIRE. Therefore, we must wait until WU's expire to send them out to be completed.

Please consider either completing what's in the queue or ABORTING them. Thank you. Smile

About Woodall Prime Search

Woodall Numbers (sometimes called Cullen numbers 'of the second kind') are positive integers of the form Wn = n*2^n-1, where n is also a positive integer greater than zero. Woodall numbers that are prime are called Woodall primes (or Cullen primes of the second kind).

The Woodall numbers Wn are primes for the following n:

2, 3, 6, 30, 75, 81, 115, 123, 249, 362, 384, 462, 512, 751, 822, 5312, 7755, 9531, 12379, 15822, 18885, 22971, 23005, 98726, 143018, 151023, 667071, 1195203, 1268979, 1467763, 2013992, 2367906, and 3752948 and composite for all other n less than 9108979.

It is conjectured that there are infinitely many such primes. Currently, PirmeGrid is testing for Woodall primes in the n=9.1M level (M=mega, 10^6). The last 3 Woodall primes found by PrimeGrid are:

2013992*2^2013992−1 (Lasse Mejling Andersen): official announcement | decimal representation | Prime Pages Entry
2367906*2^2367906−1 (Stephen Kohlman): official announcement | decimal representation | Prime Pages Entry
3752948*2^3752948−1 (Matthew J. Thompson): official announcement | decimal representation | Prime Pages Entry

For more information on Woodall numbers, please visit the following sites:

Woodall Number - The Prime Glossary at the Prime Pages
Top 20 Woodall Primes - Top Twenty at the Prime Pages
Woodall Number - MathWorld--A Wolfram Web Resource
Woodall Number - Wikipedia

What is LLR?

The Lucas-Lehmer-Riesel (LLR) test is a primality test for numbers of the form N = k*2^n - 1, with 2^n > k. Also, LLR is a program developed by Jean Penne that can run the LLR-tests. It includes the Proth test to perform +1 tests and PRP to test non base 2 numbers. See also:

Lucas-Lehmer-Riesel test (WIKI)
Download LLR by Jean Penné

(Edouard Lucas: 1842-1891, Derrick H. Lehmer: 1905-1991, Hans Riesel: born 1929)

About the Autumnal Equinox

Equinox (WIKI)
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John Galt 007 · Prince Joined: 31 Dec 2007 Posts: 1206 Location: Wisconsin

I plan on being there, as usual, so POTM will be cut short for me.....

#ni-1

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Plomos · Prince Joined: 26 Apr 2011 Posts: 859

Question here, the info above mentions being able to sieve this project if the boinc units will take too long or whatever. I'm seeing there is a Woodall LLR and a Woodall sieve for boinc, do i just need to run the sieve instead of the LLR and it still counts for the challenge?
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John Galt 007 · Prince Joined: 31 Dec 2007 Posts: 1206 Location: Wisconsin

Plomos · Prince Joined: 26 Apr 2011 Posts: 859

I went ahead and asked in the challenge thread at PG to see what John says
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Gemjunkie · Posted: Tue Sep 20, 2011 12:30 pm Post subject:

No, they're just suggesting other PG tasks your shrubber can do if it's not stable enough for LLR WUs.

#ni-1

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Plomos · Prince Joined: 26 Apr 2011 Posts: 859

Yeah that's what they ended up saying over at PG I suppose I will stick with some prpnet work since the credits for that are coming in regularly now and I'd like to keep that going
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Blurf · Posted: Tue Sep 20, 2011 2:08 pm Post subject:

Meh I'll pass...
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williamd007 · Knight Joined: 13 Dec 2010 Posts: 36 Location: NJ

Before I left I set my shrubbers for the challenge. This way the team will get the points as my machines will be behind as they are already running the llr's. Good luck team!! I also noticed I'm finally listed on Primegrids home page for recent significant primes (657) out of 5000. Lower left side as Williamd007. Just sorry no team mention there. Team hope you all break a NI!

Pooh Bear 27 · Posted: Tue Sep 27, 2011 2:29 pm Post subject:

Currently:
Team:
16 The Knights Who Say Ni! 1734488.62

Individuals:
22 {KWSN}John Galt 007 961719.16
35 Pooh Bear 27 44480.49
477 BmfCb 28288.97

Pooh Bear 27 · Posted: Sat Oct 01, 2011 5:31 am Post subject:

A little over 5 days left. Here are the standings:
Team:
16 The Knights Who Say Ni! 5130572.76

Individuals:
20 {KWSN}John Galt 007 2843083.49
53 Pooh Bear 27 1511298.28
371 JT Labs 202506.82
373 Williamd007 202152.05
507 Sir Stooper 115509.87
664 Dean Sheaffer 83874.99
721 Liquid 58136.32
750 Falsehaven 57599.17
1116 BmfCb 28288.97
1166 GWH0744 28122.81

I personally should get 30 more units done by the end of the challenge.

Plomos · Prince Joined: 26 Apr 2011 Posts: 859

PG is also having a PrPNet challange this month

Pooh Bear 27 · Posted: Thu Oct 06, 2011 1:23 pm Post subject:

Final stats (before all cleanup is done*):

18 The Knights Who Say Ni! 10060423.70

22 {KWSN}John Galt 007 5559439.01
84 Pooh Bear 27 2438301.11
275 Williamd007 679994.44
344 JT Labs 529825.21
592 Dean Sheaffer 205046.71
791 Falsehaven 119754.94
828 Lennert 116640.49
839 Sir Stooper 115509.87
1090 sirenbrian 59906.80
1178 Liquid 58136.32
1255 BmfCb 55511.00
1269 jAs 32250.83
1294 Zyklops 31493.20
1381 Nicolas 30490.94
1749 GWH0744 28122.81

Only two of us in the top 100. JG is usually in the top 20, but seems to have fallen off a little. Our team has been usually in the top 15 but we fell below that this time. Oh well, it was a long run and some very hard work. One of my machines hated it and I had to scale it back to catch up.

Next challenge is Leonids 18-23 November which will be on the 321 LLR.

*On an LLR challenge points are awarded when you return a unit. If the unit is later invalid the points will be removed. So this means you could change spots by the time all the cleanup is completed.

Gemjunkie · Posted: Thu Oct 06, 2011 5:15 pm Post subject:

I think you posted results in the wrong thread.

I skipped this PG challenge after the last fiasco, plus it overlapped SIMAP.
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Pooh Bear 27 · Posted: Thu Oct 06, 2011 6:35 pm Post subject:

Gemjunkie · Posted: Thu Oct 06, 2011 7:55 pm Post subject:

Sorry, had a brain fart.

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Pooh Bear 27 · Posted: Thu Oct 13, 2011 5:41 am Post subject:

Quick update, we are not complete yet but figured I'd show how the stats do change on an LLR after it's done:

17 The Knights Who Say Ni! 10031171.27 <- Gained 1

22 {KWSN}John Galt 007 5559439.01 <- Holding
81 Pooh Bear 27 2438301.11 <- Gained 3
275 Williamd007 679994.44 <- Holding
341 JT Labs 529825.21 <- Gained 3
581 Dean Sheaffer 205046.71 <- Gained 11
818 Lennert 116640.49 <- Gained 10
831 Sir Stooper 115509.87 <- Gained 8
899 Falsehaven 90502.51 <- Lost? 71
1077 sirenbrian 59906.80 <- Gained 13
1163 Liquid 58136.32 <- Gained 15
1237 BmfCb 55511.00 <- Gained 18
1250 jAs 32250.83 <- Gained 19
1275 Zyklops 31493.20 <- Gained 19
1368 Nicolas 30490.94 <- Gained 13
1729 GWH0744 28122.81 <- Gained 20