The sixth Challenge of the 2018 Challenge series is a 7 day challenge to celebrate Oktoberfest. The challenge is being offered on the Cullen Prime Search (LLR) application.  Sep 15 18:00:00 to Sep 22 18:00:00 (UTC)
Only tasks downloaded after the start and turned in before the end will count, so no bunkering.
 
This is a LLR challenge, Intel with AVX or better (Sandybridge) will do better. Watch temps and overclock.
Multithread will get them in faster, but may not get the most PPD. First one in get the prime founder status.
 
About the Cullen Prime Search

A Cullen number in the form of n*2^n+1. Fr. James Cullen first studied these numbers in 1905 because they have interesting divisibility properties. It is conjectured that there are infinitely many n values that will yield Cullen primes, though it has been shown that almost all are composite.

Further reading:
Cullen Number on Wikipedia
Cullen prime Prime Pages' Glossary entry
Top Twenty Cullen Primes in Chris Caldwell's Database

The following n values yield prime Cullen numbers (OEIS A005849) (ones found at Primegrid highlighted):

1, 141, 4713, 5795, 6611, 18496, 32292, 32469, 59656, 90825, 262419, 361275, 481899, 1354828, 6328548, and 6679881.

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.
 

bill1024
This is a CPU project, so if you're folding with your GPU only, and want to throw some CPU cycles on this, any help is welcome.

I am up for it.

I'm in and ready to go.

A couple hours into it, will be a while before I score and points, some long tasks.
 

This one snuck up on me but I got set up in time for the start.

After 1 day:


Challenge: Oktoberfest
App: 4 (CUL-LLR)
(As of 2018-09-16 18:00:06 UTC)

6825 tasks have been sent out. [CPU/GPU/anonymous_platform: 6818 (100%) / 0 (0%) / 7 (0%)]

Of those tasks that have been sent out:

519 (8%) came back with some kind of an error. [519 (8%) / 0 (0%) / 0 (0%)]
701 (10%) have returned a successful result. [696 (10%) / 0 (0%) / 5 (0%)]
5605 (82%) are still in progress. [5603 (82%) / 0 (0%) / 2 (0%)]

Of the tasks that have been returned successfully:

632 (90%) are pending validation. [629 (90%) / 0 (0%) / 3 (0%)]
68 (10%) have been successfully validated. [66 (9%) / 0 (0%) / 2 (0%)]
0 (0%) were invalid. [0 (0%) / 0 (0%) / 0 (0%)]
1 (0%) are inconclusive. [1 (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=16778645. The leading edge was at n=16629587 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 0.90% as much as it had prior to the challenge!


That's about 6 times the normal daily rate -- but since a lot of computers take more than a day to finish a task, especially if they're not using multi-threading, that's underestimating the actual processing rate.

No primes so far. It's been 9 years since the last Cullen prime.

Current tasks are about 5% longer than at the beginning of the challenge due to an increase in FFT size. Credit is increased proportionally. And, of course, as the numbers get larger the tasks take longer to process.

Completed and validated (1^st)
What does this mean??

Fingerscrossed for a Prime..Would be great

After 4 days:


Challenge: Oktoberfest
App: 4 (CUL-LLR)
(As of 2018-09-19 19:34:48 UTC)

13649 tasks have been sent out. [CPU/GPU/anonymous_platform: 13624 (100%) / 0 (0%) / 25 (0%)]

Of those tasks that have been sent out:

1525 (11%) came back with some kind of an error. [1525 (11%) / 0 (0%) / 0 (0%)]
5334 (39%) have returned a successful result. [5311 (39%) / 0 (0%) / 23 (0%)]
6790 (50%) are still in progress. [6788 (50%) / 0 (0%) / 2 (0%)]

Of the tasks that have been returned successfully:

2846 (53%) are pending validation. [2834 (53%) / 0 (0%) / 12 (0%)]
2446 (46%) have been successfully validated. [2435 (46%) / 0 (0%) / 11 (0%)]
9 (0%) were invalid. [9 (0%) / 0 (0%) / 0 (0%)]
33 (1%) are inconclusive. [33 (1%) / 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=16919091. The leading edge was at n=16629587 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 1.74% as much as it had prior to the challenge!


No prime number found yet.

Holding Strong  @ 6  Crunching@EVGA
 

Czech National Team  Seems to have come from out of nowhere this year.
They have been doing very well in these challenges. Giving ATP and the Germans a run for their money.

128 crunchers, that will do it!!! 

With 10 hours remaining in the challenge, it's time to remind everyone...

At the Conclusion of the Challenge

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. Thank you!

Am on my last tasks here, hopefully enough to get past BC....

HK-Steve
Am on my last tasks here, hopefully enough to get past BC....

Nice Ketchup, But Heinz really is slow to flow