The On-Line Encyclopedia of Integer Sequences (OEIS)

A165624 revision #7

A165624

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

3, 1, 27, 387420489, 834385168331080533771857328695283, 6076396096647706909168138770838836135530328017648434830996201971201776350890241322455818405320466786549738961

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OFFSET

0,1

LINKS

Table of n, a(n) for n=0..5.

FORMULA

a(n) = 3^A107583(n). [R. J. Mathar, Oct 07 2009]

EXAMPLE

a(0) = 3^1/1^3 = 3. a(1) = 3^3/3^3 = 1. a(2) = 3^9/9^3 = 27.

MATHEMATICA

lst={}; Do[i=3^n/n^3; If[IntegerQ[i], AppendTo[lst, n]], {n, 6!}]; lst

Table[3^(3^n)/(3^n)^3, {n, 0, 6}] (* Harvey P. Dale, Sep 17 2019 *)

CROSSREFS

Cf. A007758, A165623

Sequence in context: A270289 A344037 A260902 * A287206 A288517 A188110

Adjacent sequences: A165621 A165622 A165623 * A165625 A165626 A165627

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Sep 22 2009

EXTENSIONS

Definition simplified by R. J. Mathar, Oct 07 2009

STATUS

proposed