1,4

Table of n, a(n) for n=1..70.

a(n) = A081604(A000045(n)). - Andrew Howroyd, Jan 01 2020

IntegerLength[Fibonacci[Range[50]], 3] (* Harvey P. Dale, Aug 13 2018 *)

(PARI) a(n)={1 + logint(fibonacci(n), 3)} \\ Andrew Howroyd, Jan 01 2020

(Magma) [#Intseq(Fibonacci(n), 3):n in [1..70]]; // Marius A. Burtea, Jan 02 2020

Cf. A000045 (Fibonacci numbers), A081604 (base-3 digits of n).

Sequence in context: A114540 A183142 A121830 * A336861 A029125 A074990

Adjacent sequences: A020908 A020909 A020910 * A020912 A020913 A020914

nonn,base

Clark Kimberling

Offset corrected and terms a(50) and beyond from Andrew Howroyd, Jan 01 2020

approved