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A060901 Exact power of 3 that divides the n-th Fibonacci number (sequence A000045). 2
1, 1, 1, 3, 1, 1, 1, 3, 1, 1, 1, 9, 1, 1, 1, 3, 1, 1, 1, 3, 1, 1, 1, 9, 1, 1, 1, 3, 1, 1, 1, 3, 1, 1, 1, 27, 1, 1, 1, 3, 1, 1, 1, 3, 1, 1, 1, 9, 1, 1, 1, 3, 1, 1, 1, 3, 1, 1, 1, 9, 1, 1, 1, 3, 1, 1, 1, 3, 1, 1, 1, 27, 1, 1, 1, 3, 1, 1, 1, 3, 1, 1, 1, 9, 1, 1, 1, 3, 1, 1, 1, 3, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

FORMULA

If n is not divisible by 4 then a(n) = 1, if n = 4 * 3^k * m where m is not divisible by 3 then a(n) = 3^(k+1).

a(n) = A038500(A000045(n)). - Michel Marcus, Jul 30 2013

EXAMPLE

a(12) = 9 because the 12th Fibonacci number is 144 and 144 = 9*16.

PROG

(PARI) a(n) = 3^valuation(fibonacci(n), 3) \\Michel Marcus, Jul 30 2013

(Haskell)

a060901 = a038500 . a000045  -- Reinhard Zumkeller, Feb 04 2015

CROSSREFS

Cf. A000045, A060865.

Cf. A038500.

Sequence in context: A069292 A091842 A306346 * A087612 A260626 A155828

Adjacent sequences:  A060898 A060899 A060900 * A060902 A060903 A060904

KEYWORD

nonn,easy

AUTHOR

Ahmed Fares (ahmedfares(AT)my-deja.com), May 05 2001

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), May 07 2001

STATUS

approved

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Last modified January 19 15:37 EST 2020. Contains 331049 sequences. (Running on oeis4.)