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A072378 Numbers n such that 12n divides F(12n) where F(m) is the m-th Fibonacci number. 6
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 24, 25, 27, 28, 30, 32, 36, 40, 42, 45, 46, 48, 50, 51, 54, 55, 56, 57, 60, 64, 70, 72, 75, 80, 81, 84, 90, 92, 96, 98, 100, 102, 108, 110, 112, 114, 120, 125, 126, 128, 135, 138, 140, 144, 150, 153, 155, 160, 162, 165 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Odd integers n such that n divides the n-th Fibonacci number form sequence A129066, while even such n's are multiples of 12.

a(n) seems to be asymptotic to a constant multiple of n^phi where phi is the golden ratio.

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..10000

EXAMPLE

3 belongs to the sequence because 3*12=36 divides F(36)=14930352. For every n, 5^n belongs to the sequence, as can be proved by induction.

MATHEMATICA

Select[Range[n], Mod[Fibonacci[12# ], 12# ]==0&]

CROSSREFS

Cf. A128974.

Sequence in context: A225732 A193988 A124455 * A248888 A112587 A141820

Adjacent sequences:  A072375 A072376 A072377 * A072379 A072380 A072381

KEYWORD

nonn

AUTHOR

Omar Antolin Camarena (omar(AT)tlahui.posgrado.unam.mx), Jul 19 2002

EXTENSIONS

Edited by Max Alekseyev, Jan 21 2010

STATUS

approved

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Last modified March 23 04:15 EDT 2017. Contains 283901 sequences.