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A050815 Number of positive Fibonacci numbers with n decimal digits. 9
6, 5, 5, 4, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 5, 4, 5, 5, 5, 4, 5, 5, 5, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

If n>1 then a(n) = 4 or 5. - Robert Gerbicz, Sep 05 2002

The sequence is almost periodic, see also A072353. - Reinhard Zumkeller, Apr 14 2005

LINKS

Table of n, a(n) for n=1..105.

Ron Knott, The Fibonacci Numbers.

Ron Knott, Fibonacci Numbers and the Golden Section

Ron Knott, [Number of digits in Fib(i)] : Calculator.

Jürgen Spilker, Die Ziffern der Fibonacci-Zahlen, Elemente der Mathematik 58 (Birkhäuser 2003).

Eric Weisstein's World of Mathematics, Fibonacci Number

Eric Weisstein's World of Mathematics, Almost Periodic Function

EXAMPLE

At length 1 there are 6 such numbers -> 1, 1, 2, 3, 5 and 8.

MATHEMATICA

Drop[Last/@Tally[Table[IntegerLength[Fibonacci[n]], {n, 505}]], -1] (* Jayanta Basu, Jun 01 2013 *)

CROSSREFS

See A098842 for another version.

Cf. A000045, A105563, A105565, A060384.

Sequence in context: A157295 A011485 A084339 * A199791 A199600 A021608

Adjacent sequences:  A050812 A050813 A050814 * A050816 A050817 A050818

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Oct 15 1999.

STATUS

approved

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Last modified April 23 03:26 EDT 2019. Contains 322380 sequences. (Running on oeis4.)