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1) Message boards : Number crunching : Yuri's Night Challenge (Message 150255)
Posted 16 days ago by Profile Michael GutierrezProject donor
The results are final!

During these 3 short days, we completed more than 258 thousand tasks. We found 7 new Wall-Sun-Sun instances, as well as 3 Wieferich instances, and our overall output was still more than 5 times WW's average -- or about 4 challenge-time Gelly's!

104 teams and 453 individuals participated in the Challenge.

Top Three Individuals:
1. Gelly
2. tng
3. Azmodes

Top Three Teams:
1. Antarctic Crunchers
2. SETI.Germany
3. Czech National Team


The next Challenge is PrimeGrid's 16th Birthday Challenge, which starts June 12. We hope to see you there! Thank you again to everyone. We appreciate your participation and hope you had fun!
2) Message boards : Number crunching : Yuri's Night Challenge (Message 150102)
Posted 31 days ago by Profile Michael GutierrezProject donor
Cleanup Status:
Apr 14: 10601 tasks outstanding; 4606 affecting individual (252) scoring positions; 1682 affecting team (30) scoring positions.
Apr 15: 6297 tasks outstanding; 2193 affecting individual (219) scoring positions; 641 affecting team (18) scoring positions.
Apr 16: 4408 tasks outstanding; 1362 affecting individual (186) scoring positions; 351 affecting team (10) scoring positions.
Apr 17: 3799 tasks outstanding; 1104 affecting individual (175) scoring positions; 229 affecting team (8) scoring positions.
Apr 18: 3533 tasks outstanding; 986 affecting individual (168) scoring positions; 219 affecting team (8) scoring positions.
Apr 19: 2926 tasks outstanding; 733 affecting individual (146) scoring positions; 187 affecting team (6) scoring positions.
Apr 20: 1570 tasks outstanding; 307 affecting individual (86) scoring positions; 14 affecting team (2) scoring positions.
Apr 21: 893 tasks outstanding; 132 affecting individual (55) scoring positions; 4 affecting team (1) scoring positions.
Apr 22: 245 tasks outstanding; 38 affecting individual (24) scoring positions; 1 affecting team (1) scoring positions.
Apr 23: 41 tasks outstanding; 5 affecting individual (5) scoring positions; 1 affecting team (1) scoring positions.
Apr 24: 34 tasks outstanding; 3 affecting individual (3) scoring positions; 1 affecting team (1) scoring positions.
Apr 25: 2 affecting individual (2) scoring positions; 1 affecting team (1) scoring positions.
Apr 26: 21 tasks outstanding; 2 affecting individual (2) scoring positions; 1 affecting team (1) scoring positions.
Apr 27: 8 tasks outstanding; 1 affecting individual (1) scoring positions; 0 affecting team (0) scoring positions.
Apr 28: 7 tasks outstanding; 1 affecting individual (1) scoring positions; 0 affecting team (0) scoring positions.
Apr 29: 4 tasks outstanding; 1 affecting individual (1) scoring positions; 0 affecting team (0) scoring positions.
3) Message boards : Number crunching : Yuri's Night Challenge (Message 150091)
Posted 32 days ago by Profile Michael GutierrezProject donor
And we're done! Final stats below; cleanup is starting soon.

Challenge: Yuri's Night
App: 33 (WW)
(As of 2021-04-14 18:39:12 UTC)

320139 tasks have been sent out. [CPU/GPU/anonymous_platform: 9086 (3%) / 309868 (97%) / 1185 (0%)]

Of those tasks that have been sent out:

3766 (1%) were aborted. [3271 (1%) / 495 (0%) / 0 (0%)]
16796 (5%) came back with some kind of an error. [736 (0%) / 16060 (5%) / 0 (0%)]
285939 (89%) have returned a successful result. [2029 (1%) / 282726 (88%) / 1184 (0%)]
12541 (4%) are still in progress. [2949 (1%) / 9592 (3%) / 0 (0%)]

Of the tasks that have been returned successfully:

11841 (4%) are pending validation. [80 (0%) / 11713 (4%) / 48 (0%)]
273765 (96%) have been successfully validated. [1949 (1%) / 270680 (95%) / 1136 (0%)]
319 (0%) were invalid. [1 (0%) / 318 (0%) / 0 (0%)]
35 (0%) are inconclusive. [0 (0%) / 35 (0%) / 0 (0%)]
4) Message boards : Number crunching : Yuri's Night Challenge (Message 150085)
Posted 32 days ago by Profile Michael GutierrezProject donor
A few hours left in the challenge! Some friendly reminders... :)

At the Conclusion of the Challenge

When the challenge completes, we would prefer users "moving on" to finish those tasks they have downloaded, if not then please ABORT the WU's (and then UPDATE the PrimeGrid project) 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.

Likewise, if you're shutting down the computer for an extended period of time, or deleting the VM (Virtual Machine), please ABORT all remaining tasks first. Also, be aware that merely shutting off a cloud server doesn't stop the billing. You have to destroy/delete the server if you don't want to continue to be charged for it.

Thank you!
5) Message boards : Number crunching : Yuri's Night Challenge (Message 150063)
Posted 33 days ago by Profile Michael GutierrezProject donor
Day 2 update:

Challenge: Yuri's Night
App: 33 (WW)
(As of 2021-04-13 13:52:53 UTC)

199366 tasks have been sent out. [CPU/GPU/anonymous_platform: 8186 (4%) / 190433 (96%) / 747 (0%)]

Of those tasks that have been sent out:

3288 (2%) were aborted. [2976 (1%) / 312 (0%) / 0 (0%)]
10970 (6%) came back with some kind of an error. [733 (0%) / 10237 (5%) / 0 (0%)]
172351 (86%) have returned a successful result. [1044 (1%) / 170561 (86%) / 746 (0%)]
12760 (6%) are still in progress. [3433 (2%) / 9326 (5%) / 1 (0%)]

Of the tasks that have been returned successfully:

10654 (6%) are pending validation. [79 (0%) / 10519 (6%) / 56 (0%)]
161499 (94%) have been successfully validated. [965 (1%) / 159844 (93%) / 690 (0%)]
174 (0%) were invalid. [1 (0%) / 173 (0%) / 0 (0%)]
35 (0%) are inconclusive. [0 (0%) / 35 (0%) / 0 (0%)]
6) Message boards : Number crunching : Yuri's Night Challenge (Message 150036)
Posted 34 days ago by Profile Michael GutierrezProject donor
24 hours in, here are the stats:
Challenge: Yuri's Night
App: 33 (WW)
(As of 2021-04-12 13:49:17 UTC)

93038 tasks have been sent out. [CPU/GPU/anonymous_platform: 6535 (7%) / 86132 (93%) / 371 (0%)]

Of those tasks that have been sent out:

2921 (3%) were aborted. [2679 (3%) / 242 (0%) / 0 (0%)]
4574 (5%) came back with some kind of an error. [26 (0%) / 4548 (5%) / 0 (0%)]
75452 (81%) have returned a successful result. [302 (0%) / 74780 (80%) / 370 (0%)]
10092 (11%) are still in progress. [3528 (4%) / 6563 (7%) / 1 (0%)]

Of the tasks that have been returned successfully:

7849 (10%) are pending validation. [53 (0%) / 7743 (10%) / 53 (0%)]
67533 (90%) have been successfully validated. [249 (0%) / 66967 (89%) / 317 (0%)]
58 (0%) were invalid. [1 (0%) / 57 (0%) / 0 (0%)]
16 (0%) are inconclusive. [0 (0%) / 16 (0%) / 0 (0%)]
7) Message boards : News : Yuri's Night Challenge starts April 11th (Message 149922)
Posted 38 days ago by Profile Michael GutierrezProject donor
The third challenge of the 2021 Series will be a 3-day challenge celebrating the 60th anniversary of Yuri Gagarin's history-making venture into outer space. The challenge will be offered on the WW application, beginning 11 April 18:00 UTC and ending 14 April 18:00 UTC.

This is a relatively new subproject here at PrimeGrid, and there are currently no known Wall–Sun–Sun primes! You could be the first to find one!

To participate in the Challenge, please select only the Wieferich and Wall-Sun-Sun Prime Search (WW) project in your PrimeGrid preferences section.

Questions? Queries? Quips? Discuss on the forum thread for this challenge. Best of luck!
8) Message boards : Number crunching : Yuri's Night Challenge (Message 149920)
Posted 38 days ago by Profile Michael GutierrezProject donor
Welcome to Yuri's Night Challenge

The third challenge of the 2021 Series will be a 3-day challenge celebrating the 60th anniversary of Yuri Gagarin's history-making venture into outer space. The challenge will be offered on the WW application, beginning 11 April 18:00 UTC and ending 14 April 18:00 UTC.

Yuri’s Night is a global celebration of humanity’s past, present, and future in space. Yuri’s Night parties and events are held around the world every April in commemoration of Yuri Gagarin becoming the first human to venture into space on April 12, 1961, and the inaugural launch of the first Space Shuttle on April 12, 1981.

Yuri’s Night events combine space-themed partying with education and outreach. These events can range from an all-night mix of techno and technology at a NASA Center, to a movie showing and stargazing at your local college, to a gathering of friends at a bar or barbecue.

In 2011, the 50th anniversary of human spaceflight, over 100,000 people attended 567 officially-recognized events in 75 countries on all 7 continents, while tens of thousands more watched the 12-hour live Yuri’s Night Global Webcast and participated online in the virtual world of Second Life.

For more info, or to watch this year's global livestream event, check out their website.

To participate in the Challenge, please select only the Wieferich and Wall-Sun-Sun Prime Search (WW) project in your PrimeGrid preferences section.

Application builds are available for Linux 64 bit, Windows 64 bit and MacIntel.

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 11th April 2021 18:00 UTC and received BEFORE 14th April 2021 18:00 UTC 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 an LLR 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. :)


What is the Wieferich and Wall-Sun-Sun Prime Search?

A Wall–Sun–Sun (or Fibonacci–Wieferich) prime is a prime p > 5 in which p^2 divides the Fibonacci number , where the Legendre symbol is defined as

They are named after Donald Dines Wall and twin brothers Zhi-Hong Sun and Zhi-Wei Sun. Drawing on Wall's work, in 1992 the brothers proved that if the first case of Fermat's last theorem was false for a certain prime p, then that p would have to be a Wall–Sun–Sun prime.

A prime p is a Wieferich prime if p^2 divides 2^(p-1) - 1. They are named after Arthur Wieferich who in 1909 proved that if the first case of Fermat’s last theorem is false for the exponent p, then p satisfies the criteria a^(p-1) = 1 (mod p^2) for a=2.

Notice the similarity in the expression p^2 divides 2^(p-1) - 1 to the special case of Fermat's little theorem p divides 2^(p-1) - 1.

For more info about the mathematics and the ranges we're searching, see these forum threads:
https://www.primegrid.com/forum_thread.php?id=9436
WW by the Numbers

9) Message boards : Number crunching : Sier"pi"nski's Birthday Challenge (Message 149827)
Posted 43 days ago by Profile Michael GutierrezProject donor
The results are final!

During these 10 days, we completed more than 8 thousand tasks. That may not sound like a lot compared to other challenges, but the size of SOB tasks means that's equivalent to more than 550 Million credits. Unfortunately, we didn't find any new primes, but our overall output was still more than 5 times SOB's average -- or about 10 tng's!

108 teams and 476 individuals participated in the Challenge.

Top Three Individuals:
1. Pavel Atnashev
2. tng
3. vaughan

Top Three Teams:
1. Czech National Team
2. Ural Federal University
3. SETI.Germany

The next Challenge is Yuri's Night Challenge, which starts April 11. We hope to see you there! Thank you again to everyone. We appreciate your participation and hope you had fun!
10) Message boards : Number crunching : Sier"pi"nski's Birthday Challenge (Message 149695)
Posted 51 days ago by Profile Michael GutierrezProject donor
Cleanup Status:
Mar 25: 512 tasks outstanding; 318 affecting individual (138) scoring positions; 127 affecting team (30) scoring positions.
Mar 26: 261 tasks outstanding; 124 affecting individual (80) scoring positions; 48 affecting team (17) scoring positions.
Mar 27: 122 tasks outstanding; 61 affecting individual (47) scoring positions; 10 affecting team (8) scoring positions.
Mar 28: 60 tasks outstanding; 30 affecting individual (24) scoring positions; 6 affecting team (6) scoring positions.
Mar 29: 28 tasks outstanding; 13 affecting individual (11) scoring positions; 2 affecting team (2) scoring positions.


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