A070632 a(n) = (2^(3^n)+1)/3^(n+1).

1, 19, 1657009, 9950006745799417075771, 19389268200585836264288587113776883575610248525384021488302948711030121

Offset

1,2

Links

Table of n, a(n) for n=1..5.

Mathematica

Table[(2^(3^n) + 1)/3^(n + 1), {n, 6}] (* Wesley Ivan Hurt, Dec 26 2023 *)

Crossrefs

Sequence in context: A177818 A269446 A172824 * A234039 A099114 A013810

Adjacent sequences: A070629 A070630 A070631 * A070633 A070634 A070635

Keyword

easy,nonn

Author

Benoit Cloitre, May 13 2002

Extensions

One more term from Benoit Cloitre, Nov 01 2002

Status

approved