%I
%S 2,5,13,41,1093,797161,21523361,926510094425921,
%T 1716841910146256242328924544641,3754733257489862401973357979128773,
%U 6957596529882152968992225251835887181478451547013
%N Primes of the form (3^x1)/2 or (3^x+1)/2.
%C The next term is too large to include.
%C The next term has 258 digits.  _Harvey P. Dale_, Dec 04 2018
%t Select[Flatten[Table[(3^x+{1,1})/2,{x,150}]],PrimeQ] (* _Harvey P. Dale_, Dec 04 2018 *)
%Y Cf. A096723.
%K nonn
%O 1,1
%A _Cino Hilliard_, Nov 17 2003
%E Edited by _Don Reble_, May 03 2006
