20170104, 18:17  #12 
Nov 2016
23·97 Posts 
Found the prime (4981)*498^1937+1.

20170104, 18:46  #13 
Jul 2003
1001001101_{2} Posts 
hi,
i read somewhere in this forum that you can not open *.7z files you may try this: https://convertio.co/de/7zzip/ if this does not help i do offer to you the following: you do send me the *.7z file(s) and i do them to *.zip files 
20170105, 05:58  #14  
Sep 2006
Brussels, Belgium
2×5×157 Posts 
Quote:
Don't send people to dubious adware sites... Just use 7zip it is open source freeware for Windows to be found at http://www.7zip.org. If you can't open such files in Linux install the p7zip package that is available in most distributions. Jacob 

20170105, 06:18  #15 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2^{2}·2,281 Posts 
The whole 7zip substory in this topic is an hilarious red herring!
It was never an issue. If anything ever was an issue here, then it would have been well described by the half a century old joke programmed by evil sysadms on some consoles: "User error. Replace the user and strike any key when ready." It seems that inept users existed long before this forum. 
20170121, 11:38  #16 
Nov 2016
23×97 Posts 
There are researches for this problem:
http://mersenneforum.org/showthread.php?t=6131 http://mersenneforum.org/showthread.php?t=8765 
20170125, 08:22  #17 
Nov 2016
100010110111_{2} Posts 
These are primes of the form (b1)*b^n+1 for 2<=b<=300, 1<=n<=512.

20170125, 08:23  #18 
Nov 2016
2231_{10} Posts 

20170125, 13:57  #19 
"Mark"
Apr 2003
Between here and the
2×3×983 Posts 
For this form check out http://harvey563.tripod.com/NearGeneralizedWoodall.txt.

20170125, 17:42  #20  
Nov 2016
23·97 Posts 
Quote:
Last fiddled with by sweety439 on 20170125 at 17:43 

20170125, 19:02  #21 
"Mark"
Apr 2003
Between here and the
2·3·983 Posts 
Sorry, you are correct.

20170127, 11:56  #22 
Nov 2016
23×97 Posts 
These are primes of the form (b+1)*b^n+1 for 2<=b<=12. (for some bases, there are their search limits in their OEIS page, but for some bases I do not know the search limit. For 6+, 6++, 7+, 9+, 9++, 11+, 11++, 12+ and 12++, I only searched them to n=1024)
Besides, although there are no OEIS sequence for 4+, 4+, 8+ and 8++, they can be given by base 2 sequences: 4+: A002253 / 2 that are integers. 4+: A001770 / 2 that are integers. 8+: A002236 / 3 that are integers. 8++: A002256 / 3 that are integers. Last fiddled with by sweety439 on 20170127 at 12:19 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Search primes of form 2*n^n ± 1  JeppeSN  And now for something completely different  27  20180412 14:20 
Primes of the form n+phi(n)  carpetpool  carpetpool  3  20170126 01:29 
Infinitely many primes of a form?  PawnProver44  Homework Help  1  20160315 22:39 
Primes of the form a^(2^n)+b^(2^n)  YuL  Math  21  20121023 11:06 
Primes of the form 2.3^n+1  Dougy  Math  8  20090903 02:44 