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Number of 4's in decimal expansion of Fibonacci(n).
9

%I #8 Dec 15 2017 17:36:30

%S 0,0,0,0,0,0,0,0,0,1,0,0,2,0,0,0,0,0,1,1,0,1,0,0,1,0,0,1,0,1,1,1,0,1,

%T 0,1,1,1,0,1,1,1,1,4,1,1,0,0,1,2,0,1,0,0,0,2,1,1,0,1,1,1,1,2,0,0,0,3,

%U 3,2,1,0,4,1,3,1,3,1,5,4,3,1,0,3,1,1,3,0,0,3,1,2,5,1,2,4,1,4,4,1,3,4,0,0,2

%N Number of 4's in decimal expansion of Fibonacci(n).

%t DigitCount[Fibonacci[Range[0,110]],10,4] (* _Harvey P. Dale_, May 02 2011 *)

%Y Cf. 0's A085854, 1's A085855, 2's A085856, 3's A085857, 5's A085859, 6's A085860, 7's A085861, 8's A085862, 9's A085863.

%K base,nonn

%O 0,13

%A _Jason Earls_, Jul 06 2003