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 2015 18:00 UTC and end 9 October 2015 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 24+ 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 2015 18:00 UTC and received BEFORE 9 October 2015 18:00 UTC will be considered for credit. We will the same credit scoring formula as we use for BOINC credits.

Therefore, each completed WU will earn a unique score based on its n value. The higher the n, the higher the score. 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 December 2013, there remain 52 k's for which no primes have been found. They are as follows:

2293, 9221, 23669, 31859, 38473, 46663, 67117, 74699, 81041, 93839, 97139, 107347, 121889, 129007, 143047, 146561, 161669, 192971, 206039, 206231, 215443, 226153, 234343, 245561, 250027, 273809, 315929, 319511, 324011, 325123, 327671, 336839, 342847, 344759, 362609, 363343, 364903, 365159, 368411, 371893, 384539, 386801, 397027, 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



• 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 1929-2014).

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

30 minutes into the challenge and just under 5000 tasks have been sent out. On normal days, we've been averaging 437 tasks per day.

I'm guessing that the very fastest computers, running the shortest of the TRP tasks may complete those tasks in about 5 hours. Perhaps a bit less if some cores are left idle to increase memory bandwidth.

Note that TRP tasks vary in length by about 50%; on my computer tasks will take somewhere between 8 and 12 hours. Most tasks are near the higher end of the range.
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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

After 1 day:

Challenge: World Animal Day
App: 15 (TRP-LLR)
(As of 2015-10-05 18:00:20 UTC)

15158 tasks have been sent out. [CPU/GPU/anonymous_platform: 15131 (100%) / 0 (0%) / 27 (0%)]

Of those tasks that have been sent out:

1955 (13%) came back with some kind of an error. [1955 (13%) / 0 (0%) / 0 (0%)]
2353 (16%) have returned a successful result. [2338 (15%) / 0 (0%) / 16 (0%)]
10850 (72%) are still in progress. [10838 (72%) / 0 (0%) / 11 (0%)]

Of the tasks that have been returned successfully:

1705 (72%) are pending validation. [1694 (72%) / 0 (0%) / 12 (1%)]
643 (27%) have been successfully validated. [639 (27%) / 0 (0%) / 4 (0%)]
1 (0%) were invalid. [1 (0%) / 0 (0%) / 0 (0%)]
4 (0%) are inconclusive. [4 (0%) / 0 (0%) / 0 (0%)]

The current leading edge (i.e., latest work unit for which work has actually been sent out to a host) is n=7743593. The leading edge was at n=7694763 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 0.63% as much as it had prior to the challenge!

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

My lucky number is 75898⁵²⁴²⁸⁸+1

Two days in the books:

Challenge: World Animal Day
App: 15 (TRP-LLR)
(As of 2015-10-06 18:08:37 UTC)

23248 tasks have been sent out. [CPU/GPU/anonymous_platform: 23187 (100%) / 0 (0%) / 61 (0%)]

Of those tasks that have been sent out:

3302 (14%) came back with some kind of an error. [3302 (14%) / 0 (0%) / 0 (0%)]
7896 (34%) have returned a successful result. [7852 (34%) / 0 (0%) / 44 (0%)]
12050 (52%) are still in progress. [12033 (52%) / 0 (0%) / 17 (0%)]

Of the tasks that have been returned successfully:

3927 (50%) are pending validation. [3900 (49%) / 0 (0%) / 27 (0%)]
3922 (50%) have been successfully validated. [3905 (49%) / 0 (0%) / 17 (0%)]
3 (0%) were invalid. [3 (0%) / 0 (0%) / 0 (0%)]
44 (1%) are inconclusive. [44 (1%) / 0 (0%) / 0 (0%)]

The current leading edge (i.e., latest work unit for which work has actually been sent out to a host) is n=7769155. The leading edge was at n=7694763 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 0.97% as much as it had prior to the challenge!

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

My lucky number is 75898⁵²⁴²⁸⁸+1

Just ate a few tasks :)

After a bit more than 3 days:

Challenge: World Animal Day
App: 15 (TRP-LLR)
(As of 2015-10-07 21:42:27 UTC)

32532 tasks have been sent out. [CPU/GPU/anonymous_platform: 32430 (100%) / 0 (0%) / 102 (0%)]

Of those tasks that have been sent out:

4433 (14%) came back with some kind of an error. [4433 (14%) / 0 (0%) / 0 (0%)]
14635 (45%) have returned a successful result. [14551 (45%) / 0 (0%) / 84 (0%)]
13464 (41%) are still in progress. [13446 (41%) / 0 (0%) / 18 (0%)]

Of the tasks that have been returned successfully:

5451 (37%) are pending validation. [5411 (37%) / 0 (0%) / 40 (0%)]
9088 (62%) have been successfully validated. [9044 (62%) / 0 (0%) / 44 (0%)]
26 (0%) were invalid. [26 (0%) / 0 (0%) / 0 (0%)]
70 (0%) are inconclusive. [70 (0%) / 0 (0%) / 0 (0%)]

The current leading edge (i.e., latest work unit for which work has actually been sent out to a host) is n=7800568. The leading edge was at n=7694763 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 1.38% as much as it had prior to the 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

#Towards 8M.

C'mon primes, start flowing already......

A head's up for crunchers: Some of the largest k's are now using an FFT size of 800K. At the beginning of the challenge, the largest FFT size was 768K. You can expect tasks with an 800K FFT to take about 7% longer than tasks with a 768K FFT.

Also note that FFT size can, and does, vary somewhat depending on CPU type. Your mileage may vary.
____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

One day to go!

Challenge: World Animal Day
App: 15 (TRP-LLR)
(As of 2015-10-08 18:24:34 UTC)

39662 tasks have been sent out. [CPU/GPU/anonymous_platform: 39528 (100%) / 0 (0%) / 134 (0%)]

Of those tasks that have been sent out:

6810 (17%) came back with some kind of an error. [6810 (17%) / 0 (0%) / 0 (0%)]
20451 (52%) have returned a successful result. [20336 (51%) / 0 (0%) / 115 (0%)]
12401 (31%) are still in progress. [12382 (31%) / 0 (0%) / 19 (0%)]

Of the tasks that have been returned successfully:

6067 (30%) are pending validation. [6029 (29%) / 0 (0%) / 38 (0%)]
14245 (70%) have been successfully validated. [14168 (69%) / 0 (0%) / 77 (0%)]
49 (0%) were invalid. [49 (0%) / 0 (0%) / 0 (0%)]
90 (0%) are inconclusive. [90 (0%) / 0 (0%) / 0 (0%)]

The current leading edge (i.e., latest work unit for which work has actually been sent out to a host) is n=7818117. The leading edge was at n=7694763 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 1.60% as much as it had prior to the challenge!
____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

With about one day to go, it's time for the usual end of challenge reminder:

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

My lucky number is 75898⁵²⁴²⁸⁸+1

Six hours to go, and there's quite a race on for first place. There's a 5% difference between zunewantan (4.8M) and Scott Brown (4.4M).

During the challenge we've been sending out about 20 times the normal number of TRP tasks, which is really, really good even for a challenge. Thank you all for your participation!

So far, we have yet to find a prime and eliminate a k during the challenge, but there's still time and hope.
____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

End of challenge numbers:

Challenge: World Animal Day
App: 15 (TRP-LLR)
(As of 2015-10-09 18:26:28 UTC)

45796 tasks have been sent out. [CPU/GPU/anonymous_platform: 45631 (100%) / 0 (0%) / 165 (0%)]

Of those tasks that have been sent out:

9841 (21%) came back with some kind of an error. [9839 (21%) / 0 (0%) / 2 (0%)]
27446 (60%) have returned a successful result. [27294 (60%) / 0 (0%) / 152 (0%)]
8229 (18%) are still in progress. [8219 (18%) / 0 (0%) / 10 (0%)]

Of the tasks that have been returned successfully:

5787 (21%) are pending validation. [5750 (21%) / 0 (0%) / 37 (0%)]
21427 (78%) have been successfully validated. [21313 (78%) / 0 (0%) / 114 (0%)]
86 (0%) were invalid. [86 (0%) / 0 (0%) / 0 (0%)]
146 (1%) are inconclusive. [145 (1%) / 0 (0%) / 1 (0%)]

The current leading edge (i.e., latest work unit for which work has actually been sent out to a host) is n=7830430. The leading edge was at n=7694763 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 1.76% as much as it had prior to the challenge!

No primes were found during the challenge.
____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

... and the cleanup begins:

Cleanup Status:

Oct-9: World Animal Day: 5925 tasks outstanding; 5424 affecting individual (287) scoring positions; 4321 affecting team (77) scoring positions.
Oct-10: World Animal Day: 4614 tasks outstanding; 4163 affecting individual (280) scoring positions; 3189 affecting team (74) scoring positions.
____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

Is it still worth running the work units I downloaded during the challenge or are they useless now?

Thank you

Is it still worth running the work units I downloaded during the challenge or are they useless now?

Thank you

Cleanup Status:

Oct-9: World Animal Day: 5925 tasks outstanding; 5424 affecting individual (287) scoring positions; 4321 affecting team (77) scoring positions.
Oct-10: World Animal Day: 4614 tasks outstanding; 4163 affecting individual (280) scoring positions; 3189 affecting team (74) scoring positions.[/quote]
Oct-11: World Animal Day: 3234 tasks outstanding; 2715 affecting individual (267) scoring positions; 2146 affecting team (63) scoring positions.

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

My lucky number is 75898⁵²⁴²⁸⁸+1

Cleanup Status:

Oct-9: World Animal Day: 5925 tasks outstanding; 5424 affecting individual (287) scoring positions; 4321 affecting team (77) scoring positions.
Oct-10: World Animal Day: 4614 tasks outstanding; 4163 affecting individual (280) scoring positions; 3189 affecting team (74) scoring positions.
Oct-11: World Animal Day: 3234 tasks outstanding; 2715 affecting individual (267) scoring positions; 2146 affecting team (63) scoring positions.
Oct-12: World Animal Day: 2507 tasks outstanding; 1953 affecting individual (252) scoring positions; 1201 affecting team (57) scoring positions.
Oct-13: World Animal Day: 1993 tasks outstanding; 1431 affecting individual (235) scoring positions; 820 affecting team (48) scoring positions.
Oct-14: World Animal Day: 1564 tasks outstanding; 1003 affecting individual (212) scoring positions; 407 affecting team (38) scoring positions.
Oct-15: World Animal Day: 1261 tasks outstanding; 751 affecting individual (196) scoring positions; 311 affecting team (33) scoring positions.
Oct-16: World Animal Day: 948 tasks outstanding; 494 affecting individual (162) scoring positions; 236 affecting team (28) scoring positions.
Oct-17: World Animal Day: 793 tasks outstanding; 409 affecting individual (152) scoring positions; 197 affecting team (25) scoring positions.
Oct-18: World Animal Day: 632 tasks outstanding; 333 affecting individual (133) scoring positions; 145 affecting team (22) scoring positions.
Oct-19: World Animal Day: 539 tasks outstanding; 275 affecting individual (118) scoring positions; 116 affecting team (19) scoring positions.
Oct-20: World Animal Day: 443 tasks outstanding; 213 affecting individual (103) scoring positions; 101 affecting team (18) scoring positions.
Oct-21: World Animal Day: 360 tasks outstanding; 179 affecting individual (90) scoring positions; 80 affecting team (15) scoring positions.
Oct-22: World Animal Day: 276 tasks outstanding; 128 affecting individual (73) scoring positions; 18 affecting team (10) scoring positions.
Oct-23: World Animal Day: 193 tasks outstanding; 76 affecting individual (56) scoring positions; 10 affecting team (5) scoring positions.
Oct-24: World Animal Day: 154 tasks outstanding; 61 affecting individual (49) scoring positions; 8 affecting team (4) scoring positions.
Oct-25: World Animal Day: 128 tasks outstanding; 51 affecting individual (42) scoring positions; 7 affecting team (4) scoring positions.
Oct-26: World Animal Day: 102 tasks outstanding; 38 affecting individual (33) scoring positions; 6 affecting team (4) scoring positions.
Oct-27: World Animal Day: 85 tasks outstanding; 28 affecting individual (24) scoring positions; 5 affecting team (4) scoring positions.
Oct-28: World Animal Day: 68 tasks outstanding; 23 affecting individual (20) scoring positions; 5 affecting team (4) scoring positions.
Oct-29: World Animal Day: 50 tasks outstanding; 16 affecting individual (15) scoring positions; 4 affecting team (3) scoring positions.
Oct-30: World Animal Day: 40 tasks outstanding; 13 affecting individual (12) scoring positions; 4 affecting team (3) scoring positions.
Oct-31: World Animal Day: 36 tasks outstanding; 11 affecting individual (11) scoring positions; 4 affecting team (3) scoring positions.
____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1

Cleanup Status:

Oct-9: World Animal Day: 5925 tasks outstanding; 5424 affecting individual (287) scoring positions; 4321 affecting team (77) scoring positions.
Oct-31: World Animal Day: 36 tasks outstanding; 11 affecting individual (11) scoring positions; 4 affecting team (3) scoring positions.
Nov-1: World Animal Day: 24 tasks outstanding; 7 affecting individual (7) scoring positions; 2 affecting team (2) scoring positions.
Nov-2: World Animal Day: 17 tasks outstanding; 5 affecting individual (5) scoring positions; 2 affecting team (2) scoring positions.
Nov-3: World Animal Day: 16 tasks outstanding; 5 affecting individual (5) scoring positions; 2 affecting team (2) scoring positions.
Nov-4: World Animal Day: 15 tasks outstanding; 4 affecting individual (4) scoring positions; 2 affecting team (2) scoring positions.
Nov-5: World Animal Day: 7 tasks outstanding; 0 affecting individual (0) scoring positions; 1 affecting team (1) scoring positions.
Nov-6: World Animal Day: 5 tasks outstanding; 0 affecting individual (0) scoring positions; 1 affecting team (1) scoring positions.
Nov-7: World Animal Day: 2 tasks outstanding; 0 affecting individual (0) scoring positions; 1 affecting team (1) scoring positions.
Nov-8: World Animal Day: 1 tasks outstanding; 0 affecting individual (0) scoring positions; 1 affecting team (1) scoring positions.
Nov-9: World Animal Day: 1 tasks outstanding; 0 affecting individual (0) scoring positions; 1 affecting team (1) scoring positions.
Nov-10: World Animal Day: 1 tasks outstanding; 0 affecting individual (0) scoring positions; 1 affecting team (1) scoring positions.
Nov-11: World Animal Day: 1 tasks outstanding; 0 affecting individual (0) scoring positions; 1 affecting team (1) scoring positions.
Nov-12: World Animal Day: 1 tasks outstanding; 0 affecting individual (0) scoring positions; 1 affecting team (1) scoring positions.
____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898⁵²⁴²⁸⁸+1