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%I #9 May 28 2015 16:33:27
%S 7,37,271,2269,19927,129159847,1162320517,
%T 49269609804781974450852068861184694669,
%U 589881151426658740854227725580736348850640632297373414091790995505756623268837
%N Primes of the form 3^(2n-3)+3^(n-1)+1.
%C The corresponding n are in A199191.
%C The next term -- a(10) -- has 152 digits. - _Harvey P. Dale_, May 28 2015
%F Primes in A198410.
%t a={}; Do[p=( (3^(n-1) + 1)^3 -1)/3^n; If[PrimeQ[p], AppendTo[a, p]], {n, 10^2}]; Print[a];
%t Select[Table[3^(2n-3)+3^(n-1)+1,{n,100}],PrimeQ] (* _Harvey P. Dale_, May 28 2015 *)
%Y Cf. A198410, A199191.
%K nonn
%O 1,1
%A _Michel Lagneau_, Nov 03 2011
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