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11) Message boards : Generalized Fermat Prime Search : Guess the number of digits in the LAST GFN-17-LOW prime (Message 153492)
Posted 7 days ago by Profile Michael GoetzProject donor
With regards to the "largest 17-Low prime", all of the candidates greater than 999,937 digits now have at least one task completed. While there are still 167 candidates lacking a second, verifying task, the odds that one of them both is prime and has an erroneous result is exceedingly small. It's therefore extremely likely that 42550702^131072+1 is the largest GFN-17 prime with fewer than a million digits. Since some tasks are likely to time out more than once, it's likely that it will be a couple of weeks until this is proven conclusively.
12) Message boards : Number crunching : Tour de Primes 2022 (Message 153483)
Posted 8 days ago by Profile Michael GoetzProject donor
Tour de Primes 2022

Welcome to the 13th annual Tour de Primes. 2 is the first prime number...and the only even one. This makes it unique among prime numbers. Therefore, February is declared Prime month...being the 2nd month of the year. :) And there's no better way to pay homage to a prime number than to go out and find one. :) More precisely, a Top 5000 prime.

Special rule for 2022: Even if PPSE drops off the T5K list, it will still be eligible for TdP.

For the month of February, an informal competition is offered. There are no challenge points to be gained... just a simple rare jersey at the end of the month to add to your badge list. No pressure or stress other than what you put on yourself. :)

For 2022, we're bringing back the badges introduced in 2018:


  • Red Jersey -- discoverer of largest prime
  • Yellow Jersey -- prime count leader (tiebreaker will be prime score)
  • Green Jersey -- points (prime score) leader
  • Polk-a-dot Jersey -- on the 19th of February we'll have a "Mountain Stage" and award the Polk-a-dot Jersey to the one who finds the most primes on that day (tiebreaker will be prime score for that day).
  • Prime badge -- awarded to everyone who finds an eligible prime during the month of February. This is a counter badge, so if you find more than one prime it will show how many you've found, up to 99.
  • Mega prime badge -- awarded to everyone who finds a mega prime during February. This is a counter badge.
  • Mountain Stage prime badge -- awarded to everyone who finds an eligible prime during the Mountain Stage. This is a counter badge.
  • Mountain Stage mega prime badge -- awarded to everyone who finds a mega prime during the Mountain Stage. This is a counter badge.



Results will be available at http://www.primegrid.com/challenge/tdp_2022.php.

As we've done for the last couple of years, there will also be a "just for giggles" Double Checker scoreboard at http://www.primegrid.com/challenge/tdp_2022_dc.php.

As with the last few years, for all primes (BOINC and PRPNet) we're using the new reporting system whereby the prime's date of discovery determines whether it's eligible for the Tour de Primes. Prior to 2014, the date of verification for BOINC primes was used while the discovery date was used for PRPNet primes. The current system is more intuitive and fairer.

Note that SGS-LLR and GFN-15 are too small to be reported to the Top 5000 primes list and are therefore not eligible for the 2022 Tour de Primes.

Currently, the fastest opportunities to find Top 5000 primes is with the PPSE (LLR), and GFN-16 (65536) projects. Of course, should someone find a prime in the mega-prime searches, this would certainly give them a good shot at the green or red jerseys. Not a guarantee, however, as in 2021 there were 67 mega primes found in the Tour de Primes. Overall, in 2021 we averaged over five mega primes per week for the entire year, so you might need more than "merely" a mega prime to take home green.

All ports in PRPNet are available for the competition.

To participate in BOINC PPSE (LLR), GFN-16, or any other eligible LLR or Genefer project, all you have to do is select it in your PrimeGrid preferences. AP27 sequences are not reportable at T5K, so are not eligible for Tour de Primes. WW primes are also not reportable to T5K.

Sieve projects don't find primes, so PPS-Sieve can't find anything in TdP.

Good Luck, have fun, and enjoy! :D

Previous Winners

- BarryAZ
- boss
- BarryAZ
- tng

- tng*
- RFGuy_KCCO
- Scott Brown
- mattozan

- Honza
- Scott Brown
- 288larsson
- [AF>EDLS]GuL

- Robish
- [AF>Amis des Lapins] dthonon
- [AF>Amis des Lapins] dthonon
- tng*

- wdethomas
- tng*
- wdethomas
- tng*

- boss
- Scott Brown
- boss
- Orange_1050

- Scott Brown
- Randall J. Scalise
- vmc

- [DPC]x-RaY99_the_one_man_team
- [DPC]x-RaY99_the_one_man_team
- Lonnie Christensen

- [DPC]x-RaY99_the_one_man_team
- [DPC]x-RaY99_the_one_man_team
- PBT_marian_boss

- Scott Brown
- Usucapio Libertatis
- Scott Brown

- shanky123
- [BOINCstats] LostBoy
- Snf*

- lennart
- lennart
- [SG]marodeur6

- lennart
- s-yama
- lennart

Full rankings can be seen here: 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021

Totals by Year

    2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 Total Primes found 212 309 766 646 238 254 254 346 246 256 277 377 423 Total Score 457.30 2663.27 21803.72 20727.04 15614.83 20982.77 30268.46 43656.50 40201.94 55393.50 63588.96 130171.15 258893.74




Tips and Strategies:

Tip #1: For all GFN and for PPSE, he (or she) who finds the prime FIRST is the discover of the prime. It's a competition between you and your wingman. While having a fast computer helps, your computer is only useful when it's running a task. If you have a cache of tasks sitting on your computer waiting to run, chances are your wingman will return the task before you've even started it. Setting both BOINC cache settings to "0 days" is strongly recommended. People with slow computers find primes all the time because their wingman downloaded the task yesterday but won't start running it until tomorrow. Set your cache to 0 days!

However, larger LLR searches (PPS or larger) use LLR2, and you're not competing against another user to be first. For LLR2 projects, tip #1 does not apply.

If you're going to ignore tip #1 for GFN or PPSE, don't even bother reading the rest. Seriously.

Tips for LLR:


  • Your mileage may vary. What works for me may not work for you. Before TdP starts, take some time and experiment and see what works best on your computer.
  • If you have a CPU with hyperthreading, either turn off the hyperthreading in the BIOS, or set BOINC to use 50% of the processors. (But see below for exceptions.)

    • 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.


  • Use LLR's multithreaded mode. It requires a little bit of setup, but it's worth the effort. Follow these steps:

    • Use multi-threading on larger tasks. What constitutes "larger" varies according to how fast your CPU is and your personal tastes.
    • It's no longer necessary to use app_config.xml to set up multi-threading. On the PrimeGrid preferences page, set "Multi-threading: Max # of threads for each task" to "No limit" to use the maximum number of threads for each task, or select a specific thread count if you prefer.


Tips for GFN:


  • Only run GFN on a GPU. Use your CPU for LLR tasks where it will be much more efficient.
  • Unless you have a really slow GPU and a really fast CPU, leave a CPU core free to service the GPU. You'll want the more powerful GPU running at full speed, even if it slows down the CPU somewhat. A hyperthread should be sufficient if your CPU supports hyperthreading. For example, on a 4 core CPU (without hyperthreading), you could set BOINC to "use 75% of the CPUs" to reserve one core for the GPU.

13) Message boards : Number crunching : Heptadecagenarian Challenge (Message 153469)
Posted 8 days ago by Profile Michael GoetzProject donor
And we're done!

Challenge: Heptadecagenarian
App: 24 (GFN-17-LOW)
(As of 2022-01-20 17:37:14 UTC)

386571 tasks have been sent out. [CPU/GPU/anonymous_platform: 130571 (34%) / 255997 (66%) / 3 (0%)]

Of those tasks that have been sent out:

5687 (1%) were aborted. [2973 (1%) / 2714 (1%) / 0 (0%)]
2357 (1%) came back with some kind of an error. [23 (0%) / 2334 (1%) / 0 (0%)]
365618 (95%) have returned a successful result. [122548 (32%) / 243069 (63%) / 1 (0%)]
12543 (3%) are still in progress. [4809 (1%) / 7732 (2%) / 2 (0%)]

Of the tasks that have been returned successfully:

11775 (3%) are pending validation. [4042 (1%) / 7733 (2%) / 0 (0%)]
353733 (97%) have been successfully validated. [118459 (32%) / 235273 (64%) / 1 (0%)]
108 (0%) were invalid. [46 (0%) / 62 (0%) / 0 (0%)]
2 (0%) are inconclusive. [1 (0%) / 1 (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=42597768. The leading edge was at b=41169654 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 3.47% as much as it had prior to the challenge!

Challenge: Heptadecagenarian
App: 25 (GFN-17-MEGA)
(As of 2022-01-20 17:37:32 UTC)

960842 tasks have been sent out. [CPU/GPU/anonymous_platform: 337862 (35%) / 622980 (65%) / 0 (0%)]

Of those tasks that have been sent out:

14309 (1%) were aborted. [6750 (1%) / 7559 (1%) / 0 (0%)]
4507 (0%) came back with some kind of an error. [54 (0%) / 4453 (0%) / 0 (0%)]
890690 (93%) have returned a successful result. [303040 (32%) / 587650 (61%) / 0 (0%)]
45653 (5%) are still in progress. [25353 (3%) / 20264 (2%) / 0 (0%)]

Of the tasks that have been returned successfully:

44228 (5%) are pending validation. [13973 (2%) / 30109 (3%) / 0 (0%)]
846400 (95%) have been successfully validated. [289016 (32%) / 557530 (63%) / 0 (0%)]
45 (0%) were invalid. [33 (0%) / 12 (0%) / 0 (0%)]
20 (0%) are inconclusive. [20 (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=100640298. The leading edge was at b=97068184 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 3.68% as much as it had prior to the challenge!


30 primes were found; 9 GFN-17-Low, and 21 GFN-17-MEGA.
14) Message boards : Generalized Fermat Prime Search : Guess the number of digits in the LAST GFN-17-LOW prime (Message 153432)
Posted 9 days ago by Profile Michael GoetzProject donor
All of the 17-low tasks have been sent out.

As of right now, Monkeydee would win, with an exact match on the the number of digits.

However, there's 2267 candidates with more digits that are still in progress, and 233 of those don't have any results yet. So it's not over yet!
15) Message boards : General discussion : Suggestion for challenge pages (Message 153426)
Posted 10 days ago by Profile Michael GoetzProject donor
Add a Team link to the Individuals, and visa versa. Instead of having to head to the main page each time, you can swap between the two. Probably towards the top to make it easier.


Looking into it, but I want to make sure any changes don't break any of the bots that read those reports for statistics. It might or might not make it in before this challenge ends. It's a trivial change to make, but I don't want to inadvertently blow up someone's stats collection.
16) Message boards : Generalized Fermat Prime Search : Guess the number of digits in the LAST GFN-17-LOW prime (Message 153422)
Posted 10 days ago by Profile Michael GoetzProject donor
How is the winner determined? It's unlikely someone will guess the exact number of digits, so is it whomever is closest to the last prime? Or something else?

EDIT: The latest (not yet public) prime is between Pilgrim's and Michael Millerick's guesses. That means everyone with a guess lower than Pilgrim's (999,249) is officially out of the running.
17) Message boards : Number crunching : Heptadecagenarian Challenge (Message 153405)
Posted 10 days ago by Profile Michael GoetzProject donor
Are there tasks available? Or is the server not running? Even for MEGA?


There’s well over a hundred thousand GFN-17-Low tasks available, and effectively an infinite number of GFN-17-Mega tasks. If you’re not getting tasks, the most common reason is that you have another PrimeGrid task suspended.
18) Message boards : General discussion : Best music ever (Message 153392)
Posted 10 days ago by Profile Michael GoetzProject donor
The was a pleasure to watch and listen to.
19) Message boards : Number crunching : Heptadecagenarian Challenge (Message 153389)
Posted 10 days ago by Profile Michael GoetzProject donor
*** WARNING! ***

We expect that GFN-17-Low will permanently exhaust its supply of work within the next 24 hours. If you have not already done so, in order to avoid having your computers become idle during the challenge, we strongly recommend adding GFN-17-MEGA to your task selections.
20) Message boards : Number crunching : Heptadecagenarian Challenge (Message 153388)
Posted 10 days ago by Profile Michael GoetzProject donor
I do not see my results of the Heptadecagenarian Challenge on the board although I am running low and mega and had some first´s as well.
What am I doing wrong?


To be eligible for this (or any) PrimeGrid challenge, a task must be both sent to you and returned by you during the challenge. All of the tasks you've returned so far were sent to you before the challenge started, and are thus ineligible.

Being first doesn't matter for challenge scoring.

If you want to participate in the challenge, I recommend aborting all the tasks whose "sent" date is earlier than 2022-01-17 17:17:00.


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