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A074724 Largest power of 3 dividing F(4n) where F(k) is the k-th Fibonacci number. 0
3, 3, 9, 3, 3, 9, 3, 3, 27, 3, 3, 9, 3, 3, 9, 3, 3, 27, 3, 3, 9, 3, 3, 9, 3, 3, 81, 3, 3, 9, 3, 3, 9, 3, 3, 27, 3, 3, 9, 3, 3, 9, 3, 3, 27, 3, 3, 9, 3, 3, 9, 3, 3, 81, 3, 3, 9, 3, 3, 9, 3, 3, 27, 3, 3, 9, 3, 3, 9, 3, 3, 27, 3, 3, 9, 3, 3, 9, 3, 3, 243, 3, 3, 9, 3, 3, 9, 3, 3, 27, 3, 3, 9, 3, 3, 9, 3, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

if m=1, 2 or 3 (mod 4) F(m) is not divisible by 3.

LINKS

Table of n, a(n) for n=1..98.

FORMULA

If k =1 or 2 (mod 3) a(3^m*k) = 3^(m+1) for m>=0

MATHEMATICA

Table[3^IntegerExponent[Fibonacci[4n], 3], {n, 100}] (* Harvey P. Dale, Jun 03 2012 *)

CROSSREFS

Sequence in context: A144809 A225074 A127795 * A109932 A071909 A134662

Adjacent sequences:  A074721 A074722 A074723 * A074725 A074726 A074727

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Sep 04 2002

STATUS

approved

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Last modified October 17 22:16 EDT 2019. Contains 328134 sequences. (Running on oeis4.)