This site is supported by donations to The OEIS Foundation.



110 people attended OEIS-50 (videos, suggestions); annual fundraising drive to start soon (donate); editors, please edit! (stack is over 300), your editing is more valuable than any donation.

(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A199191 n such that 3^(2n-3)+3^(n-1)+1 is prime. 2


%S 2,3,4,5,6,10,11,41,83,160,178,526,881,2578,3772

%N n such that 3^(2n-3)+3^(n-1)+1 is prime.

%C n such that A198410(n) is prime.

%t Select[Range[250], PrimeQ[((3^(#-1) + 1)^3 -1)/3^#]&]

%Y Cf. A198410, A199192.

%K nonn,hard

%O 1,1

%A _Michel Lagneau_, Nov 03 2011

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified October 30 14:32 EDT 2014. Contains 248818 sequences.