A070632 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A070632

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

%I #9 Jun 13 2024 07:44:09

%S 1,19,1657009,9950006745799417075771,

%T 19389268200585836264288587113776883575610248525384021488302948711030121

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

%t Table[(2^(3^n) + 1)/3^(n + 1), {n, 6}] (* _Wesley Ivan Hurt_, Dec 26 2023 *)

%K easy,nonn

%O 1,2

%A _Benoit Cloitre_, May 13 2002

%E One more term from _Benoit Cloitre_, Nov 01 2002