20200209, 22:36  #155 
"Sam"
Nov 2016
3·103 Posts 

20200211, 03:58  #156  
Nov 2016
2·5·223 Posts 
Quote:


20200211, 04:17  #157  
"Sam"
Nov 2016
3·103 Posts 
Quote:
2*3^n+1 up to n = 5M 4*3^n+1 up to n = 2.5M BTW, Ryan found more terms for 2*3^n+1: https://primes.utm.edu/primes/page.php?id=130431 https://primes.utm.edu/primes/page.php?id=130429 Feel free to update your text files if you want. I will let you know when I start testing primes of the form (b+1)*b^n+1 and/or b^n+(b+1). To make matters simple, I am only focusing on those b that are a power of 3. Edit: sweety439, I should inform you that I am no longer searching for repunitPRPs as it was a couple years ago since I found a PRP large enough for http://primenumbers.net/. (Yes, I still search for PRPs in general, but they don't have any mathematical description so they are not submitted to the PRP top). Last fiddled with by carpetpool on 20200211 at 04:25 

20200211, 11:05  #158  
Nov 2016
2×5×223 Posts 
Quote:


20200211, 23:38  #159  
"Sam"
Nov 2016
135_{16} Posts 
Quote:
Last fiddled with by carpetpool on 20200211 at 23:40 

20200212, 07:55  #160 
Mar 2006
Germany
2845_{10} Posts 
I've updated the Wiki entry for 2*3^n+1, but I don't know the exact range checked so far, at OEIS there's no limit given.
@carpetpool: You could update your found primes and ranges tested there by yourself. Also you could reserve it there, too. 
20200507, 22:27  #161 
Feb 2019
2^{3}×3^{2} Posts 
huge disappoinment
Okay, so Propper took on 4*3^n+1 without looking for / asking / ignoring my reservation and has now submitted two new primes to T5K. I now officially wasted a year of effort (and electricity). Even more bad, he found a mega prime, which I'd have found in literally a few days and it would have been my first mega prime.
So that's the story. I'll abandon the search. 
20200509, 00:32  #162 
"Sam"
Nov 2016
3·103 Posts 
I'm working on a posting sieve files for some sequences so situations like these won't occur again. Anybody can test them as long as they reserve that sequence. I'm expecting to have some sequences out in a week or two.

20200515, 18:33  #163 
"Sam"
Nov 2016
100110101_{2} Posts 
Sieving/Reserving MP 11
Ranges will be updated and posted later. 
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