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A075775 Numbers n such that n divides phi(F(n)) where F(n) denotes the n-th Fibonacci number. 0

%I

%S 1,10,11,12,14,15,18,20,21,22,24,25,26,27,28,29,30,33,34,35,36,37,38,

%T 39,40,41,42,44,45,46,48,49,50,51,52,53,54,55,56,58,60,62,63,64,65,66,

%U 67,68,69,70,72,73,74,75,76,77,78,80,81,82,84,85,86,88,89,90,91,92,93

%N Numbers n such that n divides phi(F(n)) where F(n) denotes the n-th Fibonacci number.

%t Select[Range[100],Divisible[EulerPhi[Fibonacci[#]],#]&] (* _Harvey P. Dale_, Jun 11 2015 *)

%Y Cf. A065449.

%K easy,nonn

%O 1,2

%A _Benoit Cloitre_, Oct 09 2002

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Last modified May 18 13:09 EDT 2021. Contains 343995 sequences. (Running on oeis4.)