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A178764 Ratio of the primitive part of Fibonacci(n) to the product of primitive prime factors of Fibonacci(n). 4

%I

%S 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,

%T 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,

%U 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

%N Ratio of the primitive part of Fibonacci(n) to the product of primitive prime factors of Fibonacci(n).

%C 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.

%H T. D. Noe, <a href="/A178764/b178764.txt">Table of n, a(n) for n=1..10000</a>

%H Florian Luca, Carl Pomerance, and Stephen Wagner, <a href="http://www.math.dartmouth.edu/~carlp/fibinttalk.pdf">Fibonacci Integers (preprint)</a>

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

%K nonn

%O 1,6

%A _T. D. Noe_, Jun 10 2010

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Last modified October 18 01:04 EDT 2019. Contains 328135 sequences. (Running on oeis4.)