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

1, 19, 1657009, 9950006745799417075771, 19389268200585836264288587113776883575610248525384021488302948711030121

Offset: 1

Author

Benoit Cloitre, May 13 2002

Keywords

• easy
• nonn

Programs

Mathematica

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

Extensions

One more term from Benoit Cloitre, Nov 01 2002