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1,3

Table of n, a(n) for n=1..74.

a(n) = 1 + floor( log_2( A000045(n) ) ).

a(n) = A070939(A000045(n)). - R. J. Mathar, Aug 11 2012

f[n_] := 1 + Floor@ Log2@ Fibonacci@ n; Array[f, 74] (* Robert G. Wilson v, Jun 24 2011 *)

IntegerLength[#, 2]&/@Fibonacci[Range[80]] (* Harvey P. Dale, Feb 11 2015 *)

Sequence in context: A004523 A038372 A121930 * A075357 A094331 A135672

Adjacent sequences: A020906 A020907 A020908 * A020910 A020911 A020912

nonn,easy,base

Clark Kimberling

More terms from James A. Sellers

approved