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

2, 5, 13, 41, 1093, 797161, 21523361, 926510094425921, 1716841910146256242328924544641, 3754733257489862401973357979128773, 6957596529882152968992225251835887181478451547013

Offset

1,1

Comments

The next term is too large to include.

The next term has 258 digits. - Harvey P. Dale, Dec 04 2018

Links

Table of n, a(n) for n=1..11.

Mathematica

Select[Flatten[Table[(3^x+{1, -1})/2, {x, 150}]], PrimeQ] (* Harvey P. Dale, Dec 04 2018 *)

Crossrefs

Cf. A096723.

Sequence in context: A007269 A179264 A096724 * A262934 A149869 A149870

Adjacent sequences: A088550 A088551 A088552 * A088554 A088555 A088556

Keyword

nonn

Author

Cino Hilliard, Nov 17 2003

Extensions

Edited by Don Reble, May 03 2006

Status

approved