Welcome to the World Space Week Challenge

The sixth challenge of the 2022 Series will be a 7-day challenge in celebration of the annual United Nations education event, World Space Week. The challenge will be offered on the TRP-LLR application, beginning 04 October 12:00 UTC and ending 11 October 12:00 UTC.

From https://www.worldspaceweek.org:

World Space Week is an international celebration of science and technology, and their contribution to the betterment of the human condition. The United Nations General Assembly declared in 1999 that World Space Week will be held each year from October 4-10. These dates commemorate two events:

October 4, 1957: Launch of the first human-made Earth satellite, Sputnik 1, thus opening the way for space exploration
October 10, 1967: The signing of the Treaty on Principles Governing the Activites of States in the Exploration and Peaceful Uses of Outer Space, including the Moon and Other Celestial Bodies.

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To participate in the Challenge, please select only the The Riesel Problem (LLR) project in your PrimeGrid preferences section.

Note on LLR2 tasks: LLR2 has eliminated the need for a full doublecheck task on each workunit, but has replaced it with a short verification task. Expect to receive a few tasks about 1% of normal length.

Application builds are available for Linux 32 and 64 bit, Windows 32 and 64 bit and MacIntel. Intel and recent AMD CPUs with FMA3 capabilities (Haswell or better for Intel, Zen-2 or better for AMD) will have a very large advantage, and Intel CPUs with dual AVX-512 (certain recent Intel Skylake-X and Xeon CPUs) will be the fastest.

Note that LLR is running the latest AVX-512 version of LLR which takes full advantage of the features of these newer CPUs. It's faster than the previous LLR app and draws more power and produces more heat, especially if they're highly overclocked. If you have certain recent Intel Skylake-X and Xeon CPUs, especially if it's overclocked or has overclocked memory, and haven't run the new AVX-512 LLR before, we strongly suggest running it before the challenge while you are monitoring the temperatures.

Multi-threading is supported and IS recommended. (TRP-LLR tasks on one CPU core take about 28 hours on average.)

Those looking to maximize their computer's performance during this challenge, or when running LLR in general, may find this information useful.

• Your mileage may vary. Before the challenge starts, take some time and experiment and see what works best on your computer.
  
• If you have a CPU with hyperthreading or SMT, either turn off this feature in the BIOS, or set BOINC to use 50% of the processors.
  
  
  • If you're using a GPU for other tasks, it may be beneficial to leave hyperthreading on in the BIOS and instead tell BOINC to use 50% of the CPU's. This will allow one of the hyperthreads to service the GPU.

  
  

• The new multi-threading system is now live. Click here to set the maximum number of threads. This will allow you to select multi-threading from the project preferences web page. No more app_config.xml. It works like this:
  
  
  • In the preferences selection, there are selections for "max jobs" and "max cpus", similar to the settings in app_config.
    
  • Unlike app_config, these two settings apply to ALL apps. You can't chose 1 thread for SGS and 4 for SoB. When you change apps, you need to change your multithreading settings if you want to run a different number of threads.
    
  • There will be individual settings for each venue (location).
    
  • This will eliminate the problem of BOINC downloading 1 task for every core.
    
  • The hyperthreading control isn't possible at this time.
    
  • The "max cpus" control will only apply to LLR apps. The "max jobs" control applies to all apps.

  
  

• If you want to continue to use app_config.xml for LLR tasks, you need to change it if you want it to work. Please see this message for more information.
  
• Some people have observed that when using multithreaded LLR, hyperthreading is actually beneficial. We encourage you to experiment and see what works best for you.

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 at the very top, above the countdown clock.

Scoring Information

Scores will be kept for individuals and teams. Only tasks issued AFTER ${c.start} and received BEFORE ${c.end} will be considered for credit. We will be using the same scoring method as we currently use for BOINC credits. 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.

At the Conclusion of the Challenge

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

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

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

About the Riesel Problem

Hans Ivar Riesel (May 28, 1929 in Stockholm - December 21, 2014) was 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 of 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 24, 2021, there remain 44 k's for which no primes have been found. They are as follows:

23669, 31859, 38473, 46663, 67117, 74699, 81041, 93839, 97139, 107347, 121889, 129007, 143047, 161669, 206231, 215443, 226153, 234343, 245561, 250027, 315929, 319511, 324011, 325123, 327671, 336839, 342847, 344759, 362609, 363343, 364903, 365159, 368411, 371893, 384539, 386801, 397027, 409753, 444637, 470173, 474491, 477583, 485557, 494743

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

To participate in effort, please select The Riesel Problem (LLR) project in your PrimeGrid preferences section.

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.

Primes found at PrimeGrid

191249*2^3417696-1 by Jonathan Pritchard on 21 Nov 2010. Official Announcement
428639*2^3506452-1 by Brett Melvold on 14 Jan 2011. Official Announcement
65531*2^3629342-1 by Adrian Schori on 5 Apr 2011. Official Announcement
123547*2^3804809-1 by Jakub Łuszczek on 8 May 2011. Official Announcement
415267*2^3771929-1 by Alexey Tarasov on 8 May 2011. Official Announcement
141941*2^4299438-1 by Scott Brown on 26 May 2011. Official Announcement
353159*2^4331116-1 by Jaakko Reinman on 31 May 2011. Official Announcement
162941*2^993718-1 by Dmitry Domanov on 02 February 2012. Official Announcement
252191*2^5497878-1 by Jan Haller on 23 June 2012. Official Announcement.
398023*2^6418059-1 by Vladimir Volynsky on 5 October 2013. Official Announcement.
304207*2^6643565-1 by Randy Ready on 10 October 2013. Official Announcement.
40597*2^6808509-1 by Frank Meador on 25 December 2013. Official Announcement.
402539*2^7173024-1 by Walter Darimont on 2 October 2014. Official Announcement.
502573*2^7181987-1 by Denis Iakovlev on 4 October 2014. Official Announcement.
273809*2^8932416-1 by Wolfgang Schwieger on 13 December 2017. Official Announcement.
146561*2^11280802-1 by Pavel Atnashev on 17 November 2020. Official Announcement.
9221*2^11392194-1 by Barry Schnur on 7 Feb 2021. Official Announcement

Primes found outside PrimeGrid

2293*2^12918431-1 by Ryan Propper on February 13 2021.
192971*2^14773498-1 by Ryan Propper on March 7 2021.
206039*2^13104952-1 by Ryan Propper on April 26 2021.

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
  

What is LLR2?

LLR2 is an improvement to the LLR application developed by our very own Pavel Atnashev and stream. It utilizes Gerbicz checks to enable the Fast DoubleCheck feature, which will nearly double the speed of PrimeGrid's progress on the projects it's applied to. For more information, see this forum post.
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Time flies like an arrow. Fruit flies like a banana.

Challenge: World Space Week
App: 15 (TRP-LLR)
Fast DC tasks are NOT included.
(As of 2022-10-07 00:19:54 UTC)

35602 tasks have been sent out. [CPU/GPU/anonymous_platform: 35602 (100%) / 0 (0%) / 0 (0%)]

Of those tasks that have been sent out:

2136 (6%) were aborted. [2136 (6%) / 0 (0%) / 0 (0%)]
78 (0%) came back with some kind of an error. [78 (0%) / 0 (0%) / 0 (0%)]
19246 (54%) have returned a successful result. [19246 (54%) / 0 (0%) / 0 (0%)]
14142 (40%) are still in progress. [14142 (40%) / 0 (0%) / 0 (0%)]

Of the tasks that have been returned successfully:

2904 (15%) are pending validation. [2904 (15%) / 0 (0%) / 0 (0%)]
16342 (85%) have been successfully validated. [16342 (85%) / 0 (0%) / 0 (0%)]
1 (0%) were invalid. [1 (0%) / 0 (0%) / 0 (0%)]
0 (0%) are inconclusive. [0 (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=13417280. The leading edge was at n=13122603 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 2.25% as much as it had prior to the challenge!
____________

Time flies like an arrow. Fruit flies like a banana.

Challenge: World Space Week
App: 15 (TRP-LLR)
Fast DC tasks are NOT included.
(As of 2022-10-07 20:28:13 UTC)

44470 tasks have been sent out. [CPU/GPU/anonymous_platform: 44470 (100%) / 0 (0%) / 0 (0%)]

Of those tasks that have been sent out:

2452 (6%) were aborted. [2452 (6%) / 0 (0%) / 0 (0%)]
78 (0%) came back with some kind of an error. [78 (0%) / 0 (0%) / 0 (0%)]
27369 (62%) have returned a successful result. [27369 (62%) / 0 (0%) / 0 (0%)]
14571 (33%) are still in progress. [14571 (33%) / 0 (0%) / 0 (0%)]

Of the tasks that have been returned successfully:

3011 (11%) are pending validation. [3011 (11%) / 0 (0%) / 0 (0%)]
24358 (89%) have been successfully validated. [24358 (89%) / 0 (0%) / 0 (0%)]
2 (0%) were invalid. [2 (0%) / 0 (0%) / 0 (0%)]
0 (0%) are inconclusive. [0 (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=13493520. The leading edge was at n=13122603 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 2.83% as much as it had prior to the challenge!

____________

Time flies like an arrow. Fruit flies like a banana.

Challenge: World Space Week
App: 15 (TRP-LLR)
Fast DC tasks are NOT included.
(As of 2022-10-10 07:14:10 UTC)

76962 tasks have been sent out. [CPU/GPU/anonymous_platform: 76962 (100%) / 0 (0%) / 0 (0%)]

Of those tasks that have been sent out:

6081 (8%) were aborted. [6081 (8%) / 0 (0%) / 0 (0%)]
352 (0%) came back with some kind of an error. [352 (0%) / 0 (0%) / 0 (0%)]
51875 (67%) have returned a successful result. [51875 (67%) / 0 (0%) / 0 (0%)]
18654 (24%) are still in progress. [18654 (24%) / 0 (0%) / 0 (0%)]

Of the tasks that have been returned successfully:

3292 (6%) are pending validation. [3292 (6%) / 0 (0%) / 0 (0%)]
48583 (94%) have been successfully validated. [48583 (94%) / 0 (0%) / 0 (0%)]
2 (0%) were invalid. [2 (0%) / 0 (0%) / 0 (0%)]
0 (0%) are inconclusive. [0 (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=13732540. The leading edge was at n=13122603 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 4.65% as much as it had prior to the challenge!
____________

Time flies like an arrow. Fruit flies like a banana.

I don't think anyone should be banned.
There are also crunchers who would like to do only proof tasks.

And we're done! Here are the stats:

Challenge: World Space Week
App: 15 (TRP-LLR)
Fast DC tasks are NOT included.
(As of 2022-10-11 20:26:57 UTC)

91632 tasks have been sent out. [CPU/GPU/anonymous_platform: 91632 (100%) / 0 (0%) / 0 (0%)]

Of those tasks that have been sent out:

14774 (16%) were aborted. [14774 (16%) / 0 (0%) / 0 (0%)]
691 (1%) came back with some kind of an error. [691 (1%) / 0 (0%) / 0 (0%)]
63458 (69%) have returned a successful result. [63458 (69%) / 0 (0%) / 0 (0%)]
10529 (11%) are still in progress. [10529 (11%) / 0 (0%) / 0 (0%)]

Of the tasks that have been returned successfully:

2746 (4%) are pending validation. [2746 (4%) / 0 (0%) / 0 (0%)]
60712 (96%) have been successfully validated. [60712 (96%) / 0 (0%) / 0 (0%)]
2 (0%) were invalid. [2 (0%) / 0 (0%) / 0 (0%)]
0 (0%) are inconclusive. [0 (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=13783970. The leading edge was at n=13122603 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 5.04% as much as it had prior to the challenge!
____________

Time flies like an arrow. Fruit flies like a banana.

Cleanup Status:

Oct 12: 1689 tasks outstanding; 769 affecting individual (164) scoring positions; 292 affecting team (30) scoring positions.
Oct 13: 933 tasks outstanding; 328 affecting individual (112) scoring positions; 128 affecting team (19) scoring positions.
Oct 18: 76 tasks outstanding; 9 affecting individual (8) scoring positions; 0 affecting team (0) scoring positions.
Oct 19: 70 tasks outstanding; 9 affecting individual (8) scoring positions; 0 affecting team (0) scoring positions.
____________

Time flies like an arrow. Fruit flies like a banana.

The results are final!
During the 7 day challenge, we completed 125104 tasks (including doublechecks).

130 teams and 566 individuals participated in the challenge.

Top Three Individuals:
1. [TA]Skillz with 11,452 tasks completed
2. tng with 6,643 tasks completed
3. vaughan with 5,478 tasks completed

Top Three Teams:
1. TeAm AnandTech with 27,298 tasks completed
2. Antarctic Crunchers with 17,242 tasks completed
3. Czech National Team with 10,923 tasks completed

Great work everyone, see you in the next challenge: the Prime Meridian Challenge starts in 6 days as of posting!
____________

Time flies like an arrow. Fruit flies like a banana.

Michael you do a very good job of managing all these challenges and posting all the relevant data Thank You!!!!