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A178764 Ratio of the primitive part of Fibonacci(n) to the product of primitive prime factors of Fibonacci(n). 4
1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 13, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

COMMENTS

Except for a(6), it can be shown that all terms are either 1 or prime. In the first 10^5 terms, only 151 are greater than 1.

LINKS

T. D. Noe, Table of n, a(n) for n=1..10000

Florian Luca, Carl Pomerance, and Stephen Wagner, Fibonacci Integers (preprint)

FORMULA

a(n) = A061446(n) / A178763(n).

CROSSREFS

Sequence in context: A204160 A184101 A164561 * A070010 A293768 A046564

Adjacent sequences:  A178761 A178762 A178763 * A178765 A178766 A178767

KEYWORD

nonn

AUTHOR

T. D. Noe, Jun 10 2010

STATUS

approved

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Last modified September 17 22:53 EDT 2019. Contains 327147 sequences. (Running on oeis4.)