This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A138468 #16 Jun 07 2025 11:57:25
%S A138468 1,0,0,1,0,0,1,0,1,1,0,1,2,1,0,2,1,0,3,2,2,3,0,3,4,2,1,3,1,3,5,4,3,3,
%T A138468 4,4,3,3,4,5,3,4,5,4,4,3,3,3,6,5,7,6,5,2,6,6,4,6,5,8,7,6,5,6,7,5,7,7,
%U A138468 9,8,5,7,9,5,8,7,10,6,8,11,11,8,5,5,12,7,10,9,8,7,12,11,11,11,11,9,12
%N A138468 Number of even digits in Fibonacci numbers.
%C A138468 Zero is counted as an even digit.
%H A138468 Robert Israel, <a href="/A138468/b138468.txt">Table of n, a(n) for n = 0..10000</a>
%H A138468 Ron Knott, <a href="http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fibtable.html">The Fibonacci Numbers</a>.
%F A138468 a(n) = A060384(n) - A136610(n). - _Robert Israel_, May 25 2017
%e A138468 The Fibonacci number 2584 has three even digits in it, so a(18) = 3.
%t A138468 Table[Total[Boole[EvenQ/@IntegerDigits[Fibonacci[n]]]],{n,0,96}] (* _James C. McMahon_, Jun 07 2025 *)
%Y A138468 Cf. A000045, A060384, A136610.
%K A138468 nonn,base,less
%O A138468 0,13
%A A138468 _Parthasarathy Nambi_, May 18 2008
%E A138468 a(0) corrected, and more terms from _Robert Israel_, May 25 2017