A138468 Number of even digits in Fibonacci numbers.

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, 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, 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

Offset

0,13

Comments

Zero is counted as an even digit.

Links

Robert Israel, Table of n, a(n) for n = 0..10000

Ron Knott, The Fibonacci Numbers.

Formula

a(n) = A060384(n) - A136610(n). - Robert Israel, May 25 2017

Example

The Fibonacci number 2584 has three even digits in it, so a(18) = 3.

Mathematica

Table[Total[Boole[EvenQ/@IntegerDigits[Fibonacci[n]]]], {n, 0, 96}] (* James C. McMahon, Jun 07 2025 *)

Crossrefs

Cf. A000045, A060384, A136610.

Sequence in context: A025665 A357022 A025841 * A337548 A029296 A096419

Adjacent sequences: A138465 A138466 A138467 * A138469 A138470 A138471

Keyword

nonn,base,less

Author

Parthasarathy Nambi, May 18 2008

Extensions

a(0) corrected, and more terms from Robert Israel, May 25 2017

Status

approved