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1) Message boards : Number crunching : Sophie Germain's Birthday Challenge (Message 139598)
Posted 49 days ago by Profile Michael GutierrezProject donor
The results are final!

Top 3 Individuals:
1. NightCoffee
2. B2lee
3. tng*

Top 3 Teams:
1. Aggie The Pew
2. Czech National Team
3. Antarctic Crunchers

Congrats to all participants on our most successful SGS challenge yet! We almost crashed the server this time! See you all at the soon-to-be-renamed Top Gun Challenge in June!
2) Message boards : Number crunching : Sophie Germain's Birthday Challenge (Message 139445)
Posted 55 days ago by Profile Michael GutierrezProject donor
Cleanup Status:

Apr 5: Sophie Germain's Birthday: 24406 tasks outstanding; 4927 affecting individual (121) scoring positions; 521 affecting team (6) scoring positions.
Apr 6: Sophie Germain's Birthday: 21340 tasks outstanding; 3881 affecting individual (112) scoring positions; 440 affecting team (6) scoring positions.
Apr 7: Sophie Germain's Birthday: 15889 tasks outstanding; 2236 affecting individual (84) scoring positions; 68 affecting team (4) scoring positions.
Apr 8: Sophie Germain's Birthday: 12018 tasks outstanding; 1478 affecting individual (65) scoring positions; 57 affecting team (4) scoring positions.
Apr 9: Sophie Germain's Birthday: 7151 tasks outstanding; 690 affecting individual (35) scoring positions; 16 affecting team (2) scoring positions.
Apr 10: Sophie Germain's Birthday: 340 tasks outstanding; 10 affecting individual (4) scoring positions; 0 affecting team (0) scoring positions.
3) Message boards : Number crunching : Sophie Germain's Birthday Challenge (Message 139440)
Posted 55 days ago by Profile Michael GutierrezProject donor
And we're done! Cleanup will be starting soon, it will take about 2-3 weeks.

Challenge: Sophie Germain's Birthday
App: 2 (SGS-LLR)
(As of 2020-04-05 04:11:45 UTC)

3776445 tasks have been sent out. [CPU/GPU/anonymous_platform: 3775096 (100%) / 0 (0%) / 1349 (0%)]

Of those tasks that have been sent out:

16997 (0%) were aborted. [16997 (0%) / 0 (0%) / 0 (0%)]
2804 (0%) came back with some kind of an error. [2804 (0%) / 0 (0%) / 0 (0%)]
3659125 (97%) have returned a successful result. [3657786 (97%) / 0 (0%) / 1339 (0%)]
31124 (1%) are still in progress. [31112 (1%) / 0 (0%) / 0 (0%)]

Of the tasks that have been returned successfully:

29333 (1%) are pending validation. [29313 (1%) / 0 (0%) / 4 (0%)]
3624112 (99%) have been successfully validated. [3622793 (99%) / 0 (0%) / 1335 (0%)]
5623 (0%) were invalid. [5623 (0%) / 0 (0%) / 0 (0%)]
57 (0%) are inconclusive. [57 (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 k=5176581829347. The leading edge was at k=5025298185495 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 3.01% as much as it had prior to the challenge!
4) Message boards : Number crunching : Sophie Germain's Birthday Challenge (Message 139385)
Posted 56 days ago by Profile Michael GutierrezProject donor
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 : Sophie Germain's Birthday Challenge (Message 139383)
Posted 56 days ago by Profile Michael GutierrezProject donor
Only a few hours left on the clock!

Challenge: Sophie Germain's Birthday
App: 2 (SGS-LLR)
(As of 2020-04-04 04:31:17 UTC)

3379887 tasks have been sent out. [CPU/GPU/anonymous_platform: 3378673 (100%) / 0 (0%) / 1214 (0%)]

Of those tasks that have been sent out:

8827 (0%) were aborted. [8827 (0%) / 0 (0%) / 0 (0%)]
2579 (0%) came back with some kind of an error. [2579 (0%) / 0 (0%) / 0 (0%)]
3250356 (96%) have returned a successful result. [3250984 (96%) / 0 (0%) / 1206 (0%)]
119877 (4%) are still in progress. [119776 (4%) / 0 (0%) / 8 (0%)]

Of the tasks that have been returned successfully:

99945 (3%) are pending validation. [100207 (3%) / 0 (0%) / 31 (0%)]
3145171 (97%) have been successfully validated. [3145534 (97%) / 0 (0%) / 1175 (0%)]
5010 (0%) were invalid. [5011 (0%) / 0 (0%) / 0 (0%)]
230 (0%) are inconclusive. [232 (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 k=5161155314187. The leading edge was at k=5025298185495 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 2.70% as much as it had prior to the challenge!
6) Message boards : Number crunching : Sophie Germain's Birthday Challenge (Message 139323)
Posted 58 days ago by Profile Michael GutierrezProject donor
One day, THIRTY-SIX primes down!

Challenge: Sophie Germain's Birthday
App: 2 (SGS-LLR)
(As of 2020-04-02 15:08:11 UTC)

1281124 tasks have been sent out. [CPU/GPU/anonymous_platform: 1280592 (100%) / 0 (0%) / 532 (0%)]

Of those tasks that have been sent out:

6063 (0%) were aborted. [6063 (0%) / 0 (0%) / 0 (0%)]
1358 (0%) came back with some kind of an error. [1358 (0%) / 0 (0%) / 0 (0%)]
1168557 (91%) have returned a successful result. [1168349 (91%) / 0 (0%) / 528 (0%)]
105363 (8%) are still in progress. [105218 (8%) / 0 (0%) / 4 (0%)]

Of the tasks that have been returned successfully:

84881 (7%) are pending validation. [85152 (7%) / 0 (0%) / 49 (0%)]
1081311 (93%) have been successfully validated. [1080832 (92%) / 0 (0%) / 479 (0%)]
2097 (0%) were invalid. [2097 (0%) / 0 (0%) / 0 (0%)]
268 (0%) are inconclusive. [268 (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 k=5076469071957. The leading edge was at k=5025298185495 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 1.02% as much as it had prior to the challenge!
7) Message boards : Number crunching : Sophie Germain's Birthday Challenge (Message 139250)
Posted 59 days ago by Profile Michael GutierrezProject donor
Two hours down, we've already found NINE primes!

Challenge: Sophie Germain's Birthday
App: 2 (SGS-LLR)
(As of 2020-04-01 13:20:51 UTC)

79211 tasks have been sent out. [CPU/GPU/anonymous_platform: 79183 (100%) / 0 (0%) / 28 (0%)]

Of those tasks that have been sent out:

143 (0%) were aborted. [143 (0%) / 0 (0%) / 0 (0%)]
64 (0%) came back with some kind of an error. [64 (0%) / 0 (0%) / 0 (0%)]
34081 (43%) have returned a successful result. [34065 (43%) / 0 (0%) / 20 (0%)]
44923 (57%) are still in progress. [44915 (57%) / 0 (0%) / 8 (0%)]

Of the tasks that have been returned successfully:

17358 (51%) are pending validation. [17354 (51%) / 0 (0%) / 8 (0%)]
16630 (49%) have been successfully validated. [16618 (49%) / 0 (0%) / 12 (0%)]
40 (0%) were invalid. [40 (0%) / 0 (0%) / 0 (0%)]
53 (0%) are inconclusive. [53 (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 k=5028389327997. The leading edge was at k=5025298185495 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 0.06% as much as it had prior to the challenge!
8) Message boards : Number crunching : Year of the Rat Challenge (Message 139154)
Posted 62 days ago by Profile Michael GutierrezProject donor
The results are final!

Top 3 Individuals:
1. Pavel Atnashev
2. tng*
3. Sean

Top 3 Teams:
1. Czech National Team
2. Ural Federal University
3. Aggie The Pew

Very well done everyone! See you at Sophie Germain's Birthday Challenge!
9) Message boards : News : Sophie Germain's Birthday Challenge (Message 139150)
Posted 62 days ago by Profile Michael GutierrezProject donor
In honor of the 244th birthday of Marie-Sophie Germain, French mathematician and namesake of the Sophie Germain Prime Search subproject, PrimeGrid will be running a 3-day SGS challenge from 1 April 12:00 UTC to 4 April 12:00 UTC!

It's been 4 years since we've found a twin or Sophie Germain prime, perhaps it's time to end the drought!

Inquiries? Interjections? Discuss in the forum post for the challenge: https://www.primegrid.com/forum_thread.php?id=9086
10) Message boards : Number crunching : Sophie Germain's Birthday Challenge (Message 139149)
Posted 62 days ago by Profile Michael GutierrezProject donor
Welcome to Sophie Germain's Birthday Challenge!

The third challenge of the 2020 Series will be a 3-day challenge celebrating the 244th birthday of Sophie Germain, French mathematician and namesake of the Sophie Germain Prime Search subproject. The challenge will be offered on the SGS (LLR) application, beginning 1 April 12:00 UTC and ending 4 April 12:00 UTC.

By the beginning of the 19th century, Fermat's Last Theorem had already established itself as the most challenging problem in number theory. Mathematicians had merely succeeded in showing that there are no solutions to the following equations:
x³ + y³ = z³
x⁴ + y⁴ = z⁴
An infinite number of other equations remained, and mathematicians still had to demonstrate that none of these had any solutions. There was no progress until a young French woman reinvigorated the pursuit of Fermat's lost proof.

Marie-Sophie Germain was born on April 1, 1776 to a well-off family in Paris. From an early age, she became obsessed with number theory and the works of Euler and Newton. Despite discouragement from her parents and the gender norms of the era, she continued to pursue her passion, eventually earning wide renown through her correspondences with Lagrange, Legendre, Gauss, and others under a male pseudonym, M. LeBlanc.
Later work was finally submitted under her own name and on 8 January 1816, she became the first woman to win a prize from the Paris Academy of Sciences. While some consider her work lacking in rigor, almost all agree that it was from the lack of a formal education that was denied to her based on her gender.
Still, there's no question of her mathematical genius. Her work on Fermat's Last Theorem provided a foundation for mathematicians exploring the subject for hundreds of years after. She proved that there are no solutions to
xᵖ + yᵖ = zᵖ,
where p is a Sophie Germain prime number.

To participate in the Challenge, please select only the Sophie Germain Prime Search LLR (SGS) project in your PrimeGrid preferences section.

NOTE: If the candidate being tested is indeed prime, the task will take TWICE as long to complete. This is because it's checking for a twin prime!

Application builds are available for Linux 32 and 64 bit, Windows 32 and 64 bit and MacIntel. Intel and Zen2-based AMD CPUs with FMA3 capabilities (Haswell, Broadwell, Skylake, Kaby Lake, Coffee Lake, and Ryzen 3rd gen) 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.

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. Tasks on one CPU core will take about 20 minutes on fast/newer computers and 2 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. :)

Highly overclocked Haswell, Broadwell, Skylake, Kaby Lake or Coffee Lake (i.e., Intel Core i7, i5, and i3 -4xxx or better) computers running the application will see fastest times. Note that SGS 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. 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.

Please, please, please make sure your machines are up to the task.


Multi-threading optimisation instructions

Those looking to maximise 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 an Intel CPU with hyperthreading, either turn off the hyperthreading 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. 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 1st April 2020 12:00 UTC and received BEFORE 4th March 2020 12:00 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. :)


About the Sophie Germain Prime Search

A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. For example, 5 is a Sophie Germain prime because it is prime and 2 × 5 + 1 = 11, is also prime. These numbers are named after Marie-Sophie Germain, an extraordinary "French mathematician who made important contributions to the fields of differential geometry and number theory and to the study of Fermat's Last Theorem." (Wiki)

We'll be searching the form k*2^n-1. If it is prime, then we'll check k*2^n+1, k*2^(n-1)-1, & k*2^(n+1)-1. The opportunity to find SG's and Twins in the same subproject is appealing.

For more information about Sophie Germain primes, please visit these links:
http://primes.utm.edu/glossary/page.php?sort=SophieGermainPrime
http://mathworld.wolfram.com/SophieGermainPrime.html
http://en.wikipedia.org/wiki/Sophie_Germain_prime

For more information about Marie-Sophie Germain, please visit these links:
http://en.wikipedia.org/wiki/Sophie_Germain
http://www.pbs.org/wgbh/nova/proof/germain.html

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:



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