20190902, 17:43  #1 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
10010000101001_{2} Posts 
Some new Generalized Cullen and Woodall primes
(offtopic) It looks like PrimeGrid found either a Cullen or a Woodall.
We will likely see it posted in a couple days. The n is apparently going to be even (in n*b^{n} +/ 1, and n >> 17,000,000, so  more than a 5 million digiter). Super! P.S. Well, this is a generalized Cullen ...slightly less exciting  but still very cool. 
20190902, 18:04  #2 
Sep 2002
Database er0rr
3,527 Posts 
I am looking forward to their publication of their new top 20 prime.

20190903, 06:49  #3 
Sep 2002
Database er0rr
3,527 Posts 
It is actually 3,921,539 digits (rank 21) and is being tested at UTM now. The newly discovered prime is 2805222*25^2805222+1
Serge played a part in this by noting that n*b^n+1 can be tested quicker by testing n*(sqrt(b))^(2*n)+1, by over 10% when using the LLR program. 
20190904, 00:40  #4  
Jun 2015
Vallejo, CA/.
2×5×97 Posts 
Quote:
It becomes the largest Generalized Cullen superseding the one discovered last year in March that had 2,913,785 digits. http://www.primegrid.com/download/gc411806676.pdf Last fiddled with by rudy235 on 20190904 at 00:51 

20190904, 15:56  #5 
Romulan Interpreter
Jun 2011
Thailand
3·17·179 Posts 
Yeaaa on the way to 100M digits! Any long way starts with a small step...
Congrats! 
20190905, 04:44  #6 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
10010000101001_{2} Posts 
{blowhard mode on}
My GW is still top 1! :) {blowhard mode off /} 
20190911, 21:09  #7  
Jun 2015
Vallejo, CA/.
2·5·97 Posts 
Quote:
http://www.primegrid.com/download/gc252805222.pdf 

20190917, 12:33  #8 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2429_{16} Posts 
A generalized Woodall is on its way, too. (and it is a nearquasirepdigit, too.)
There could be a couple more in the bag  over a week or so. 
20190930, 21:26  #9  
Sep 2002
Database er0rr
3,527 Posts 
Quote:
Last fiddled with by paulunderwood on 20190930 at 21:33 

20191026, 19:55  #10 
Sep 2002
Database er0rr
3,527 Posts 
Congrats ro Serge and Ryan for the 20th largest known prime: 2740879*32^2740879  1

20191027, 05:04  #11  
Jun 2015
Vallejo, CA/.
3CA_{16} Posts 
Quote:
It is the largest Generalized Woodall and with 4125441 digits it is the Third Prime with more than 4 million Digits (and < than 5M) Congratulations to Ryan and Serge 

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