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
____________

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

how much work remains on this task. what are the approximate deadlines for the completion of the subproject?

how much work remains on this task. what are the approximate deadlines for the completion of the subproject?

This is propably a stupid question but will there be special badges awarded for Yuri's Night Challange or will credits be counted towards WW?

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%)]
____________

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