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On 11 March 2018, 23:54:40 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 [Link] “Cullen prime” in The Prime Glossary.
The prime is 2,913,785 digits long and enters [Link] Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Cullen primes and 27th overall.
Base 41 was one of 12 prime-less Generalized Cullen bases below b=121 that PrimeGrid is searching. The remaining bases are 13, 25, 29, 47, 49, 55, 69, 73, 101, 109 & 121.
The discovery was made by Hiroyuki Okazaki ([Link] zunewantan) of Japan using an Intel(R) Xeon(R) E5-2670 CPU @ 2.60GHz with 4GB RAM, running Linux. This computer took about 7 hours and 13 minutes to complete the primality test using multithreaded LLR. Hiroyuki is a member of the [Link] Aggie The Pew team.
The prime was verified on 12 March 2018 09:07:23 UTC by Scott Brown ([Link] Scott Brown) of t...
By primegrid at 2018-03-17
To celebrate the start of Chinese new year, PrimeGrid is hosting a 7 day challenge from March 16th 2018, 18:00 UTC until March 23rd, 18:00 UTC.
Work units from the 321 (LLR) project, which are downloaded and completed during the challenge will count towards your challenge score.
For more information, questions and chit chat concerning this challenge, please join us in [Link] this thread. And as always we hope to see you there and feel free to spread the word.
By primegrid at 2018-03-16
Dear VGTU project@Home users,
We are constantly working on the current research problem.
Although, you don’t see changes in the client applications (versions are the same), generation of work and assimilation/processing of the results are changed from time to time.
After one of such changes, the bug was introduced into generation of tasks (workunits). We believe that we have fixed this bug in work generator on Monday, March 12. It seems that there are no problems with the tasks/workunits generated since then. However, some older erroneous work units may still be there… We don’t know exactly which to cancel them. Don’t worry, no time is lost: application simply fails to start and generates ERR_TOO_MANY_EXITS error after some number of trials.
The good news is that we have started to write a draft of the paper on the current research using our BOINC project.
With best regards,
The Project Team.
By vgtu project@home at 2018-03-16
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