login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A280690 a(n) = A000045(n) / A105800(n); the n-th Fibonacci number divided by its largest Fibonacci proper divisor. 4
1, 1, 2, 3, 5, 4, 13, 7, 17, 11, 89, 18, 233, 29, 122, 47, 1597, 76, 4181, 123, 842, 199, 28657, 322, 15005, 521, 5777, 843, 514229, 1364, 1346269, 2207, 39602, 3571, 709805, 5778, 24157817, 9349, 271442, 15127, 165580141, 24476, 433494437, 39603, 1860497, 64079, 2971215073, 103682, 598364773, 167761, 12752042, 271443 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A000045 is a divisibility sequence.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..377

Wikipedia, Divisibility sequence

FORMULA

a(n) = A000045(n) / A105800(n) = A000045(n) / A000045(A032742(n)).

a(n) = A280687(A000045(n)).

Other identities. For all n >= 1:

a(A032742(n)) = A280689(n).

PROG

(Scheme, two alternatives)

(define (A280690 n) (/ (A000045 n) (A105800 n)))

(define (A280690 n) (A280687 (A000045 n)))

CROSSREFS

Cf. A000045, A032742, A105800, A280687, A280689.

Sequence in context: A309373 A131401 A061446 * A240000 A193770 A107476

Adjacent sequences:  A280687 A280688 A280689 * A280691 A280692 A280693

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jan 11 2017

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 17 06:52 EDT 2019. Contains 327119 sequences. (Running on oeis4.)