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1) Message boards : Number crunching : A Prime Chinese New Year Challenge (Message 159783)
Posted 2 days ago by Profile Michael GutierrezProject donor
Cleanup Status:

Jan 27: 24509 tasks outstanding; 13408 affecting individual (210) scoring positions; 2630 affecting team (21) scoring positions.
Jan 28: 24509 tasks outstanding; 13408 affecting individual (210) scoring positions; 2630 affecting team (21) scoring positions.
Jan 29: 7405 tasks outstanding; 1831 affecting individual (102) scoring positions; 281 affecting team (7) scoring positions.
2) Message boards : Number crunching : A Prime Chinese New Year Challenge (Message 159713)
Posted 3 days ago by Profile Michael GutierrezProject donor
Sorry for the lack of task updates, the server has been struggling as you all are aware. We're in the cleanup phase now, good work everyone!

Cleanup Status:
Jan 27: 24509 tasks outstanding; 13408 affecting individual (210) scoring positions; 2630 affecting team (21) scoring positions.
3) Message boards : Number crunching : A Prime Chinese New Year Challenge (Message 159574)
Posted 7 days ago by Profile Michael GutierrezProject donor
Challenge: A Prime Chinese New Year
App: 21 (PPS-MEGA)
Fast DC tasks are NOT included.
(As of 2023-01-24 05:35:57 UTC)

226940 tasks have been sent out. [CPU/GPU/anonymous_platform: 226940 (100%) / 0 (0%) / 0 (0%)]

Of those tasks that have been sent out:

10347 (5%) were aborted. [10347 (5%) / 0 (0%) / 0 (0%)]
659 (0%) came back with some kind of an error. [659 (0%) / 0 (0%) / 0 (0%)]
181519 (80%) have returned a successful result. [181542 (80%) / 0 (0%) / 0 (0%)]
34457 (15%) are still in progress. [34459 (15%) / 0 (0%) / 0 (0%)]

Of the tasks that have been returned successfully:

21700 (12%) are pending validation. [21723 (12%) / 0 (0%) / 0 (0%)]
159819 (88%) have been successfully validated. [159819 (88%) / 0 (0%) / 0 (0%)]
0 (0%) were invalid. [0 (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=3447344. The leading edge was at n=3445599 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 0.05% as much as it had prior to the challenge!

Challenge: A Prime Chinese New Year
App: 25 (GFN-17-MEGA)
Fast DC tasks are NOT included.
(As of 2023-01-24 05:37:00 UTC)

722157 tasks have been sent out. [CPU/GPU/anonymous_platform: 219377 (30%) / 501315 (69%) / 1465 (0%)]

Of those tasks that have been sent out:

20197 (3%) were aborted. [5138 (1%) / 15059 (2%) / 0 (0%)]
1954 (0%) came back with some kind of an error. [98 (0%) / 1857 (0%) / 0 (0%)]
558257 (77%) have returned a successful result. [159784 (22%) / 398545 (55%) / 1 (0%)]
141826 (20%) are still in progress. [54403 (8%) / 85946 (12%) / 1464 (0%)]

Of the tasks that have been returned successfully:

292030 (52%) are pending validation. [78838 (14%) / 213265 (38%) / 0 (0%)]
266227 (48%) have been successfully validated. [80946 (14%) / 185280 (33%) / 1 (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 b=133511520. The leading edge was at b=128203838 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 6.20% as much as it had prior to the challenge!
4) Message boards : Number crunching : A Prime Chinese New Year Challenge (Message 159545)
Posted 8 days ago by Profile Michael GutierrezProject donor
Challenge: A Prime Chinese New Year
App: 21 (PPS-MEGA)
Fast DC tasks are NOT included.
(As of 2023-01-23 05:36:04 UTC)

107704 tasks have been sent out. [CPU/GPU/anonymous_platform: 107704 (100%) / 0 (0%) / 0 (0%)]

Of those tasks that have been sent out:

9165 (9%) were aborted. [9165 (9%) / 0 (0%) / 0 (0%)]
173 (0%) came back with some kind of an error. [173 (0%) / 0 (0%) / 0 (0%)]
65212 (61%) have returned a successful result. [65215 (61%) / 0 (0%) / 0 (0%)]
33167 (31%) are still in progress. [33165 (31%) / 0 (0%) / 0 (0%)]

Of the tasks that have been returned successfully:

14865 (23%) are pending validation. [14868 (23%) / 0 (0%) / 0 (0%)]
50347 (77%) have been successfully validated. [50347 (77%) / 0 (0%) / 0 (0%)]
0 (0%) were invalid. [0 (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=3446391. The leading edge was at n=3445599 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 0.02% as much as it had prior to the challenge!

Challenge: A Prime Chinese New Year
App: 25 (GFN-17-MEGA)
Fast DC tasks are NOT included.
(As of 2023-01-23 05:36:20 UTC)

373831 tasks have been sent out. [CPU/GPU/anonymous_platform: 116351 (31%) / 256015 (68%) / 1465 (0%)]

Of those tasks that have been sent out:

16210 (4%) were aborted. [4636 (1%) / 11574 (3%) / 0 (0%)]
816 (0%) came back with some kind of an error. [30 (0%) / 786 (0%) / 0 (0%)]
217874 (58%) have returned a successful result. [60228 (16%) / 157663 (42%) / 1 (0%)]
138998 (37%) are still in progress. [51480 (14%) / 86052 (23%) / 1464 (0%)]

Of the tasks that have been returned successfully:

142354 (65%) are pending validation. [38005 (17%) / 104367 (48%) / 0 (0%)]
75520 (35%) have been successfully validated. [22223 (10%) / 53296 (24%) / 1 (0%)]
0 (0%) were invalid. [0 (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 b=130904638. The leading edge was at b=128203838 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 3.15% as much as it had prior to the challenge!
5) Message boards : News : A Prime Chinese New Year Challenge starts January 22, 12:00 UTC (Message 159469)
Posted 10 days ago by Profile Michael GutierrezProject donor
Welcome to 2023! And just days away, on Jan. 22, in the Lunar Chinese calendar: the year 4721. What do you know, a prime number!

The first challenge of the 2023 PrimeGrid Challenge Series will be a 3-day challenge on the PPS-MEGA and GFN-17 MEGA applications, beginning 22 January 12:00 UTC and ending 25 January 12:00 UTC. To participate in the Challenge, please select only the Proth Mega Prime Search (LLR) and Generalized Fermat Prime Search n=17 projects in your PrimeGrid preferences section.

Inquiries? Ideas? Impressions? Interjections? Inferences? Join the discussion at https://www.primegrid.com/forum_thread.php?id=10115&nowrap=true#159335
6) Message boards : Number crunching : A Prime Chinese New Year Challenge (Message 159355)
Posted 14 days ago by Profile Michael GutierrezProject donor
I'd actually never heard of the Y4K problem, that's hilarious lmao

Also it seems someone has updated the Prime Numbers Fandom Wiki since yesterday -- to everyone's relief, I'm sure, it turns out that 4721 > 4000 after all.

The other issues are fixed too lol, thanks for pointing those out
7) Message boards : Number crunching : A Prime Chinese New Year Challenge (Message 159335)
Posted 15 days ago by Profile Michael GutierrezProject donor
Welcome to A Prime Chinese New Year Challenge

The first challenge of the 2023 Series will be a 3-day challenge on the PPS-MEGA and GFN-17 MEGA applications, beginning 22 January 12:00 UTC and ending 25 January 12:00 UTC.

Welcome to 2023! And just 7 days away, on Jan. 22, in the Lunar Chinese calendar: the year 4721. What do you know, a prime number! Here's what the Prime Numbers Fandom Wiki has to say about this number:

4,721 is a prime number between 4,001 and 7,000. 4,721 has 2 factors, 1 and 4,721. It is the ??th prime number, and the ??th prime number between 3,001 and 4,000. Cardinal Number: Unknown Ordinal Number: Unknown Roman Numeral: Unknown Factorization: 4721 Standard Form: 4,721 x 10^3 Proofs: ✅ — 4,721 can be divided by 1 ❌ — 4,721 cannot be divided by 2-4,720 ✅ — 4,721 can be divided by 4,721

Who knew that the Roman Numerals of some numbers are still unknown 🤯 It seems there are still many profound mysteries to uncover about the year 4721! What a time to be alive!

To participate in the challenge:

  • Wait until the challenge timeframe starts (or set your BOINC Client download schedule accordingly), as tasks issued before the challenge will not count.
  • In your PrimeGrid preferences section, select only the Proth Mega Prime Search (LLR) and Generalized Fermat Prime Search n=17 projects.



Important reminders:


  • 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.
  • The typical deadline for some of these WUs is longer than the challenge time-frame, so make sure your computer is able to return the WUs within 3 days. Only tasks issued AFTER the start time and returned BEFORE the finish time will be counted.
  • 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. Thanks!



Let's talk about hardware:


    Supported platforms for LLR tasks:

    • Windows: 32 bit, 64 bit
    • Linux: 32 bit, 64 bit
    • Mac: 64 bit
    • Multi-threading is not recommended for PPS-MEGA.
    • Uses fast proof tasks so no double check tasks are needed. Everyone is "first"!


    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 running LLR tasks, and CPUs with AVX-512 capabilities (certain recent Intel Skylake-X and Xeon CPUs, AMD Ryzen 7000 and EPYC 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, Xeon, or AMD Zen-4+ 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.

    Supported platforms for GFN tasks:


    • Windows: CPU x86, x64. GPU¹: Nvidia, AMD, Intel ARC.
    • Linux: CPU: x86, x64, ARM64. GPU¹: Nvidia, AMD, Intel ARC.
    • Mac: CPU: x64, ARM64. GPU¹: Nvidia, AMD, Apple M-Series.
    • For CPU tasks, multi-threading is supported and IS recommended. Click here to set the maximum number of threads.
    • All GFN use fast proof tasks so no double check tasks are needed. Everyone is "first"!

      ¹ OpenCL 1.1 or higher is required.


    GFN-17 MEGA WU's are currently averaging 35 minutes on CPU and 3 minutes on GPU.
    For a general idea of how your GPU stacks up, you can have a look at the fastest GPUs list.

    As with all number crunching, excessive heat can potentially cause permanent hardware failure. Please ensure your cooling system is sufficient. Please see this post for more details on how you can "stress test" your CPU, and please see this post for tips on running GFN on your GPU successfully.
    IMPORTANT: Overclocking -- including factory overclocking -- on Nvidia GPUs is very strongly discouraged. Even if your GPU can run other tasks without difficulty, it may be unable to run GFN tasks when overclocked.


Additional information:

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 22 January 12:00 UTC and received BEFORE 25 January 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.

More information on Generalized Fermat Numbers and the Genefer program


About the Proth Prime Search

The Proth Prime Search is done in collaboration with the Proth Search project. This search looks for primes in the form of k*2^n+1. With the condition 2^n > k, these are often called Proth primes. This project also has the added bonus of possibly finding factors of "classical" Fermat numbers or Generalized Fermat numbers. As this requires PrimeFormGW (PFGW) (a primality-testing program), once PrimeGrid finds a prime, it is then tested on PrimeGrid's servers for divisibility.

Our initial goal was to double check all previous work up to n=500K for odd k < 1200 and to fill in any gaps that were missed. We have accomplished that now and have increased it to n=800K. PG LLRNet searched up to n=200,000 and found several missed primes in previously searched ranges. Although primes that small did not make it into the Top 5000 Primes database, the work was still important as it may have led to new factors for "classical" Fermat numbers or Generalized Fermat numbers. While there are many GFN factors, currently there are only about 275 "classical" Fermat number factors known. Current primes found in PPS definitely make it into the Top 5000 Primes database.

Once the 800K goal is reached, we may head to 1M before turning our focus to smaller k values and higher n values. For example, k < 300 complete to n = 2M, k < 600 complete to n=1.5M and so on.

For more information about "Proth" primes, please visit these links:


About Proth Search

The Proth Search project was established in 1998 by Ray Ballinger and Wilfrid Keller to coordinate a distributed effort to find Proth primes (primes of the form k*2^n+1) for k < 300. Ray was interested in finding primes while Wilfrid was interested in finding divisors of Fermat number. Since that time it has expanded to include k < 1200. Mark Rodenkirch (aka rogue) has been helping Ray keep the website up to date for the past few years.

Early in 2008, PrimeGrid and Proth Search teamed up to provide a software managed distributed effort to the search. Although it might appear that PrimeGrid is duplicating some of the Proth Search effort by re-doing some ranges, few ranges on Proth Search were ever double-checked. This has resulted in PrimeGrid finding primes that were missed by previous searchers. By the end of 2008, all new primes found by PrimeGrid were eligible for inclusion in Chris Caldwell's Prime Pages Top 5000. Sometime in 2009, over 90% of the tests handed out by PrimeGrid were numbers that have never been tested. For 2010, we hope to complete our reservation to 800K and extend it to 1M.

PrimeGrid intends to continue the search indefinitely for Proth primes.

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:


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.

8) Message boards : Number crunching : Great Internet Fermat Prime Search Challenge (Message 158885)
Posted 36 days ago by Profile Michael GutierrezProject donor
SO true, I was posting daily(*) cleanup updates for last year's December GFN challenge all the way until June LOL
9) Message boards : Number crunching : Great Internet Fermat Prime Search Challenge (Message 158872)
Posted 37 days ago by Profile Michael GutierrezProject donor
The results are final!
During the 10 day challenge, we completed 21429 tasks (including doublechecks).

119 teams and 525 individuals participated in the challenge.

Top Three Individuals:
1. [TA]Skillz with 916 tasks completed
2. tng with 681 tasks completed
3. crashtech with 400 tasks completed

Top Three Teams:
1. TeAm AnandTech with 2,847 tasks completed
2. Antarctic Crunchers with 2,813 tasks completed
3. Czech National Team with 1,555 tasks completed

Thanks for a great 2022 challenge season everybody! It's been a blast. See you next year ✨
10) Message boards : Number crunching : Great Internet Fermat Prime Search Challenge (Message 158760)
Posted 42 days ago by Profile Michael GutierrezProject donor
Cleanup Status:

Dec 19: 174 tasks outstanding; 97 affecting individual (66) scoring positions; 22 affecting team (14) scoring positions.
Dec 20: 118 tasks outstanding; 64 affecting individual (46) scoring positions; 10 affecting team (10) scoring positions.
Dec 21: 78 tasks outstanding; 43 affecting individual (33) scoring positions; 8 affecting team (8) scoring positions.
Dec 22: 13 tasks outstanding; 8 affecting individual (7) scoring positions; 5 affecting team (5) scoring positions.
Dec 23: 4 tasks outstanding; 2 affecting individual (2) scoring positions; 2 affecting team (2) scoring positions.


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