The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A105565 a(n) = if (exactly 5 Fibonacci numbers exist with exactly n digits) then 1, otherwise 0. 4
 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence is almost periodic, see also A105566; a(n) = 1 - A105563(n) for n > 1. LINKS Robert Israel, Table of n, a(n) for n = 1..10000 Martin Burtscher, Igor Szczyrba, Rafał Szczyrba, Analytic Representations of the n-anacci Constants and Generalizations Thereof, Journal of Integer Sequences, Vol. 18 (2015), Article 15.4.5. 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 MAPLE n:= 1: count:= 2: a:= 0: b:= 1: for m from 2 while n < 101 do   c:= b; b:= a+b; a:= c;   s:= ilog10(b)+1;   if s = n then count:= count+1   else     if count = 5 then A[n]:= 1 else A[n]:= 0 fi;     count:= 1; n:= s   fi od: seq(A[i], i=1..100); # Robert Israel, Dec 17 2018 CROSSREFS Cf. A050815, A060384, A000045. Sequence in context: A144610 A188068 A181632 * A332814 A285418 A068717 Adjacent sequences:  A105562 A105563 A105564 * A105566 A105567 A105568 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Apr 14 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 7 06:02 EDT 2020. Contains 336274 sequences. (Running on oeis4.)