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World Record Generalized Cullen Prime!
On 18 January 2018, 19:39:18 UTC, PrimeGrid’s Generalized Cullen/Woodall Prime Search found the largest known Generalized Cullen prime:
Generalized Cullen numbers are of the form: n*b^n+1. Generalized Cullen numbers that are prime are called Generalized Cullen primes. For more information, please see “Cullen prime” in The Prime Glossary ([Link] http://primes.utm.edu/glossary/xpage/Cullens.html).
The prime is 2,732,038 digits long and enters [Link] Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Cullen primes and 30th overall.
Base 116 was one of 13 prime-less Generalized Cullen bases below b=121 that PrimeGrid is searching. The remaining bases are 13, 25, 29, 41, 47, 49, 55, 69, 73, 101, 109 & 121.
The discovery was made by Scott Brown ([Link] Scott Brown) of the United States using an Intel(R) Core(TM) i7-4770S CPU @ 3.10GHz with 4GB RAM, running Windows 10 Enterprise Edition. This computer took about 8 hours and 34 minutes to complete the primality test using multithreaded LLR. Scott is a member of the [Link] Aggie The Pew team.
The prime was verified on 19 January 2018 17:24:17 UTC by Serge De Saffel ([primegrid
Project downtime on Tue Jan 23rd
We are going to shut down the project next Tuesday, Jan 23rd at around 10 AM CET for an upgrade of our database backend systems to make them ready for the years to come. We're going to upgrade hardware parts, operating systems as well the databases themselves, which is why we need to shut down the entire project, including the BOINC backend and this very website.
Generally you don't have to do anything at your end.[Link] read more
SoFiA Production Update 6
For this week, I'm planning on running a small set of 100MB workunits through SoFiA, just as a general test. There's only 705 workunits, but each workunit should take substantially longer to process than the ones we've been doing so far. For these test workunits, we're running all ~400 parameters on each workunit, rather than splitting the parameters up in to different runs. This is only going to be the case for the test workunits, the production ones will use split parameter sets just like the 10MB workunits did.
The SoFiA VM has been updated to use the latest version of SoFiA. Hopefully, this will help increase general stability and decrease some of the problems we've been encountering.
Each VM instance will now use up to 3072MB of memory, a huge increase from the previous 256MB. I'm sorry about this, but SoFiA doesn't seem to have particularly optimal memory usage, and my local tests were running into out of memory problems at anything less than 3GB of memory. You may want to limit the number of SoFiA instances your machines run if you begin to get performance issues. I've also reported the rather large memory usage to the developers, as it may be something they can improve on in future versions.
I'll be trying to visit the forums daily to keep an eye on any issues that might crop up, so hopefully I'll be able to resolve small problems in my spare time instead of having to postpone everything until next Wednesday.
I hope this goes smoothly.
Short interruptions Tuesday
There will be a couple of short server outages while our BOINC service pass to fail-over nodes today, Tuesday 16th of January. Similar interruptions will happen next week, as we carry out security updates on our computing infrastructure.
By lhc@home classic
2017 year in review
Although the list does not look impressive, much was accomplished in 2017. The sub-searches that were completed were some of the longest so far. In summary:
1. The search over Q(sqrt(2)) (subfield 3 of 7) completed several more tiers of the search. There are about 9 tiers left to go.
2. The search over Q(sqrt(-2)) (subfield 4 of 7) filled in a bunch more rows. This one has 7 tiers left to go.
Here are the goals for the new year:
1. Develop a GPU app. I have enlisted the help of a fellow user for this. This is a lofty goal and it could be many months before the GPU app is available. This app will be critical in completing the search over Q(sqrt(2)).
2. Complete the search over Q(sqrt(-2)).
3. Start the search over Q(sqrt(-5)) (subfield 5 of 7).
GFN-262144 Mega Prime!
On 10 January 2018, 12:26:12 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:
The prime is 1,726,452 digits long and enters [Link] Chris Caldwell's The Largest Known Primes Database ranked 6th for Generalized Fermat primes and 55th overall.
The discovery was made by Rod Skinner ([Link] rjs5) of the United States using an NVIDIA GeForce GTX 1080 in an Intel(R) Core(TM) i7-8700K CPU at 3.70GHz with 16GB RAM, running Linux. This GPU took about 18 minutes to probable prime (PRP) test with GeneferOCL3. Rod is a member of the [Link] Intel Corporation team.
The PRP was confirmed prime by an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Microsoft Windows 10 Professional. This computer took about 6 hours 59 minutes to complete the primality test using LLR.
For more details, please see the [Link] official announcement.
cable provider issues
The internet struggled today and then all connections were gone. The access is working again but a little bit slow at the moment. If you still have some troubles let me know.
Happy New Year 2018!
I'm back from my 2 week break, so work will be resuming later today once the final set of SoFiA workunits have been dispatched.
Once those final 15mb workunits have finished processing, we'll be moving on to the 100mb workunits.
Before that, though, I plan on updating the SoFiA VM to use the latest version of SoFiA (rather than the fairly old one we've been using) in the hopes that we'll see some speed and reliability improvements.
I'll run a few batches of test 100mb workunits, and we'll see how they go. If we don't have any significant issues, then we'll continue on and process the rest. If we run into issues, then we'll continue to run test batches until I can work everything out.
I hope you've all had an excellent holiday period too, and are looking forward to what this year brings. I certainly am.