A055777 a(n) = 3^(3^n).

3, 27, 19683, 7625597484987, 443426488243037769948249630619149892803

Offset

0,1

Comments

a(n+1) = a(n) written in base 3 and read as if in base 27 (and recorded in base 10).

Number of distinct n-ary operators in a ternary logic. - Ross Drewe, Feb 13 2008

The next term has 116 digits. - Harvey P. Dale, Mar 28 2019

Links

Table of n, a(n) for n=0..4.

Formula

a(n) = a(n-1)^3.

Mathematica

NestList[#^3&, 3, 5] (* Harvey P. Dale, Mar 28 2019 *)

Prog

(Python)
print([3**(3**n) for n in range(5)]) # Michael S. Branicky, Mar 27 2021

Crossrefs

Cf. A001146, A023365.

Sequence in context: A068221 A068222 A308384 * A014222 A071107 A162414

Adjacent sequences: A055774 A055775 A055776 * A055778 A055779 A055780

Keyword

nonn

Author

Henry Bottomley, Jul 12 2000

Extensions

Next term is too big to include.

Status

approved