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A088553 Primes of the form (3^x-1)/2 or (3^x+1)/2. 3

%I

%S 2,5,13,41,1093,797161,21523361,926510094425921,

%T 1716841910146256242328924544641,3754733257489862401973357979128773,

%U 6957596529882152968992225251835887181478451547013

%N Primes of the form (3^x-1)/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

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Last modified October 17 12:33 EDT 2019. Contains 328112 sequences. (Running on oeis4.)