Welcome to the World Animal Day Challenge

A 5 day Challenge is being offered on PrimeGrid's The Riesel Problem (LLR) application. To participate in the Challenge, please select only the The Riesel Problem (LLR) project in your PrimeGrid preferences section. The challenge will begin 4 October 2013 18:00 UTC and end 9 October 2013 18:00 UTC. Application builds are available for Linux , Windows and MacIntel 32 bit and 64 bit. CPU's with AVX capabilities will be significantly faster than the ones without, as this instruction set allows for more computing power.

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 ~6 hours on fast/newer computers and 12+ 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. :)

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 4 October 2013 18:00 UTC and received BEFORE 9 October 2013 18:00 UTC will be considered for credit. We will use a modified version of our credit algorithm which is based on the n value (k*b^n-1) and adjusted for the type of number and FFT size to score the challenge. The main difference is that the primary and double checker of a WU will receive the same score. (The FFT size adjustment, which will be used in this challenge, isn't yet included in the real credit function.)

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 would prefer users "moving on" to finish those tasks they have downloaded, if not then please ABORT the 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. :)

Hans Ivar Riesel (born 1929 in Stockholm) is a Swedish mathematician. In 1956, he showed that there are an infinite number of positive odd integer k's such that k*2^n-1 is composite (not prime) for every integer n>=1. These numbers are now called Riesel numbers. He further showed that k=509203 was such one.

It is conjectured that 509203 is the smallest Riesel number. The Riesel problem consists in determining that 509203 is the smallest Riesel number. To show that it is the smallest, a prime of the form k*2^n-1 must be found for each of the positive integer k's less than 509203. As of April 2011, there remains 56 k's for which no primes have been found. They are as follows:

2293, 9221, 23669, 31859, 38473, 40597, 46663, 67117, 74699, 81041, 93839, 97139, 107347, 121889, 129007, 143047, 146561, 161669, 192971, 206039, 206231, 215443, 226153, 234343, 245561, 250027, 252191, 273809, 304207, 315929, 319511, 324011, 325123, 327671, 336839, 342847, 344759, 362609, 363343, 364903, 365159, 368411, 371893, 384539, 386801, 397027, 398023, 402539, 409753, 444637, 470173, 474491, 477583, 485557, 494743, 502573

For a more detailed history and status of the Riesel problem, please visit Wilfrid Keller's The Riesel Problem: Definition and Status.

Additional Information
[list]

• Riesel Number (Wolfram MathWorld)
  
• Riesel Number (Wiki)
  
• Riesel Number (The Prime Glossary)
  

The Riesel problem is to k*2^n-1 as the Sierpinski problem is to k*2^n+1. There is no equivalent to the 'prime' Sierpinski problem since k=509203, the conjectured smallest Riesel number, is prime.

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).
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PrimeGrid Challenge Overall standings --- Last update: From Pi to Paddy (2016)

The vermin horde aim to be there complete with barbeque.
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Oh Bondage? Up Yours.

http://www.youtube.com/watch?v=ogypBUCb7DA

The vermin horde aim to be there complete with barbeque.

Our BBQ will be heated by TheDawgz' new ultra turbo hot metallic red computer. Just watch out for paint fumes. And hungry rats.

Cow_tipping said "Ben benieuwd of de ratten nu wat langzamer zullen gaan."
Pyrus replied "Nee. Zeker niet tijdens de challenge. "

Too darn right. We are compensating for something.
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Oh Bondage? Up Yours.

http://www.youtube.com/watch?v=ogypBUCb7DA

Yeah and it's clearly visible what in the picture you posted :P ;)
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PrimeGrid Challenge Overall standings --- Last update: From Pi to Paddy (2016)

Thanks laydzee

I think, Herr Roedy, you will find that was a bull rather than a cow.
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Oh Bondage? Up Yours.

http://www.youtube.com/watch?v=ogypBUCb7DA

That new big rat will make a big difference, thats for sure!

Congratulations on hijacking this thread for a discussion on rodent testicles.
Very appropriate for World Animal Day.

Congratulations on hijacking this thread for a discussion on rodent testicles.
Very appropriate for World Animal Day.

Thanks. We are here all week. Try the veal and don't forget to tip the waitresses.

Will The Riesel Problem sieving count toward this challenge for non AVX capable cpus?

Will The Riesel Problem sieving count toward this challenge for non AVX capable cpus?

The Riesel Problem Sieve won't count even if you run it on an abacus.

Do you have an algorithm somewhere for an abacus? I can't seem to find it.

by the way thanks i wasnt sure by the way it was worded

Just a note: in the preferences the last challenge is still listed for trp sieve and the upcoming for trp llr is not.

Shouldn't the server be loaded with much more TRP LLR work?
As of this moment I can see 187/600 WUs, not that much for a challenge?

not trp sieve ? Ok, I`ve seen it to late, also 300 tasks, hehe

BBQ! Over at the rats'.
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Oh Bondage? Up Yours.

http://www.youtube.com/watch?v=ogypBUCb7DA

*sniff* *sniff*
I smell a prime on the horizon...
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275*2^3585539+1 is prime!!! (1079358 digits)
Proud member of Aggie the Pew

Any wild guess who will be the first to submit a completed WU?

I bet on Ross*.

Hi Timbo

It looks like many if not all your TRP w/us were downloaded before the start of the challenge. They only count if they are downloaded after the start and returned before the end.

You probably want to 1) abort those w/u and 2) join ATP.
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Oh Bondage? Up Yours.

http://www.youtube.com/watch?v=ogypBUCb7DA

Hi Timbo

I don't make the rules.

The only think I'd say is if you abort the tasks they'll go straight back into the pool for someone else to do. If they are downloaded in the next couple of days they could form part of the challenge. Meanwhile you could download some different wus and enjoy the challenge too.

All the best


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Oh Bondage? Up Yours.

http://www.youtube.com/watch?v=ogypBUCb7DA

Just checking to see if any one else was going to join in.
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Oh Bondage? Up Yours.

http://www.youtube.com/watch?v=ogypBUCb7DA

Yea. A prime is found :)


More info to come.





Lennart

Great, one k down, 54 to go!
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Twitter: IainBethune
Proud member of team "Aggie The Pew". Go Aggie!
3073428256125*2^1290000-1 is Prime!

With a bit less under one day remaining, here are some statistics on the challenge:

85124 TRP tasks have been sent out so far during the challenge.
44948 of those have been successfully returned.
33949 of those have validated.

During the challenge, n has been increased from 6497423 to 6621733.

One prime has been found.

Edit 1: We have averaged 21071 tasks per day during this challenge. Normally, we average 1267 tasks per day.

Edit 2: Of those 85 thousand challenge tasks, 23 thousand of them have gone to the individual at the top of the challenge leader board, and 15 thousand of those have been returned so far.
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Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

Idle speculation: Progress on the k where the prime was found has been stopped. Dividing "In progress" tasks by "Complete" tasks the lowest is k=9221 at 0.02043. I'll keep watching and if it goes lower then that's the k of our prime find. The next lowest is k=2293 at 0.02088, so we're down at the noise floor.

With 9-odd hours left, it's time to get those last units out and prepare for the end/clean up.

At the Conclusion of the Challenge

We would prefer users "moving on" to finish those tasks they have downloaded, if not then please ABORT the 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. :)

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PrimeGrid Challenge Overall standings --- Last update: From Pi to Paddy (2016)

23 in the world
398023*2^6418059-1

Congratulations!
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271643232^¹³¹⁰⁷²+1 GENERALIZED FERMAT :)
93*10^^1029523-1 REPDIGIT PRIME
31*332^³⁶⁷⁵⁶⁰+1 CRUS PRIME
Proud member of team Aggie The Pew. Go Aggie!

Unfortunately my computer froze while I went on vacation over the weekend, so I wasn’t able to get much work done during the challenge, but I do still plan on sitting on the project for long enough to get my gold badge out of the way. I am very glad to see that we eliminated a k during the challenge. That just means that we will be able to push the leading edge forward that much faster during the next TRP challenge.
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And that's it guys and gals! :)

Thank you for all your hard work. Any and all help in the clean up is much appreciated though by no means obligatory.
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PrimeGrid Challenge Overall standings --- Last update: From Pi to Paddy (2016)

Aggie says "BURP!!.

Thanks to those who took part. More thanks to those who made taking part possible. And congrats to the prime finder whoever he or she may be.
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Oh Bondage? Up Yours.

http://www.youtube.com/watch?v=ogypBUCb7DA

Challenge Cleanup:

9-Oct: 11045 tasks outstanding; 6373 in individual (198) scoring positions; 5478 in team (89) scoring positions.

Those who would like to help with the cleanup are welcome to do so, but as with most cleanups, it's rarely a problem getting enough computing power to do the work. It's simply a matter of waiting for the tasks to be crunched and the results returned.

Thank you everyone for a fantastic challenge!

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Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

LMFAOOO!!!

Did you enjoy that feast Aggie? ;)

Challenge Cleanup:
Those who would like to help with the cleanup are welcome to do so,

With a bit less under one day remaining, here are some statistics on the challenge:

85124 TRP tasks have been sent out so far during the challenge.
44948 of those have been successfully returned.
33949 of those have validated.

During the challenge, n has been increased from 6497423 to 6621733.

One prime has been found.

Edit 1: We have averaged 21071 tasks per day during this challenge. Normally, we average 1267 tasks per day.

Edit 2: Of those 85 thousand challenge tasks, 23 thousand of them have gone to the individual at the top of the challenge leader board, and 15 thousand of those have been returned so far.

Time to update k count:

http://www.primegrid.com/prefs.php?subset=project

Challenge Cleanup:

9-Oct: 11045 tasks outstanding; 6373 in individual (198) scoring positions; 5478 in team (89) scoring positions.
10-Oct: 8889 tasks outstanding; 4994 in individual (197) scoring positions; 4410 in team (85) scoring positions.

Those who would like to help with the cleanup are welcome to do so, but as with most cleanups, it's rarely a problem getting enough computing power to do the work. It's simply a matter of waiting for the tasks to be crunched and the results returned.

Thank you everyone for a fantastic challenge!

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Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

I do not have time to do a reboot to switch HT on, so I will stay another day in the cleanup ...
Congrats to the primefinder and good luck to all the unfortunate searchers!
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Sysadm@Nbg
my current lucky number: 3651*2^1521717+1
PSA-PRPNet-Stats-URL: http://u-g-f.de/PRPNet/

Challenge Cleanup:

9-Oct: 11045 tasks outstanding; 6373 in individual (198) scoring positions; 5478 in team (89) scoring positions.
10-Oct: 8889 tasks outstanding; 4994 in individual (197) scoring positions; 4410 in team (85) scoring positions.
11-Oct: 5136 tasks outstanding; 2641 in individual (192) scoring positions; 1870 in team (71) scoring positions.

Those who would like to help with the cleanup are welcome to do so, but as with most cleanups, it's rarely a problem getting enough computing power to do the work. It's simply a matter of waiting for the tasks to be crunched and the results returned.

The number of available cleanup tasks, if any, are shown on the PrimeGrid home pag.

Thank you everyone for a fantastic challenge!

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Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

I'd help if I could but I've had a failure of some kind and am away from home.

woot

Well done, Randy - a big prime!

Well deserved!

Challenge Cleanup:

9-Oct: 11045 tasks outstanding; 6373 in individual (198) scoring positions; 5478 in team (89) scoring positions.
10-Oct: 8889 tasks outstanding; 4994 in individual (197) scoring positions; 4410 in team (85) scoring positions.
11-Oct: 5136 tasks outstanding; 2641 in individual (192) scoring positions; 1870 in team (71) scoring positions.
12-Oct: 3802 tasks outstanding; 1844 in individual (187) scoring positions; 818 in team (63) scoring positions.
13-Oct: 2372 tasks outstanding; 1023 in individual (162) scoring positions; 311 in team (43) scoring positions.
14-Oct: 1847 tasks outstanding; 740 in individual (154) scoring positions; 160 in team (35) scoring positions.
15-Oct: 1242 tasks outstanding; 431 in individual (128) scoring positions; 102 in team (29) scoring positions.
16-Oct: 1036 tasks outstanding; 334 in individual (117) scoring positions; 88 in team (27) scoring positions.
17-Oct: 825 tasks outstanding; 226 in individual (100) scoring positions; 68 in team (23) scoring positions.
18-Oct: 643 tasks outstanding; 157 in individual (75) scoring positions; 42 in team (20) scoring positions.
19-Oct: 471 tasks outstanding; 112 in individual (59) scoring positions; 27 in team (14) scoring positions.
20-Oct: 313 tasks outstanding; 68 in individual (42) scoring positions; 18 in team (10) scoring positions.
21-Oct: 229 tasks outstanding; 48 in individual (35) scoring positions; 16 in team (10) scoring positions.
22-Oct: 156 tasks outstanding; 30 in individual (24) scoring positions; 10 in team (8) scoring positions.
23-Oct: 101 tasks outstanding; 14 in individual (13) scoring positions; 9 in team (7) scoring positions.
24-Oct: 62 tasks outstanding; 8 in individual (7) scoring positions; 5 in team (4) scoring positions.
25-Oct: 47 tasks outstanding; 5 in individual (5) scoring positions; 4 in team (4) scoring positions.
26-Oct: 28 tasks outstanding; 2 in individual (2) scoring positions; 2 in team (2) scoring positions.
27-Oct: 12 tasks outstanding; 1 in individual (1) scoring positions; 0 in team (0) scoring positions.
28-Oct: 10 tasks outstanding; 1 in individual (1) scoring positions; 0 in team (0) scoring positions.

Those who would like to help with the cleanup are welcome to do so, but as with most cleanups, it's rarely a problem getting enough computing power to do the work. It's simply a matter of waiting for the tasks to be crunched and the results returned.

The number of available cleanup tasks, if any, are shown on the PrimeGrid home page.

Thank you everyone for a fantastic challenge!
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Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

The cleanup is over and the challenge stats are now final!
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Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

And the overall stats have been updated too! :) PrimeGrid Challenge Overall standings
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PrimeGrid Challenge Overall standings --- Last update: From Pi to Paddy (2016)