A085859 Number of 5's in decimal expansion of Fibonacci(n).

0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 2, 0, 0, 0, 1, 0, 0, 0, 2, 1, 1, 1, 1, 0, 1, 2, 2, 0, 0, 0, 0, 0, 1, 1, 0, 2, 1, 1, 1, 1, 2, 2, 2, 1, 1, 3, 1, 2, 2, 1, 2, 1, 3, 0, 0, 1, 1, 1, 3, 2, 2, 1, 3, 0, 0, 1, 0, 2, 3, 1, 4, 0, 1, 0, 0, 0, 2, 1, 1, 0, 1, 3, 0, 2, 4, 3, 1, 0, 3, 2

Offset

0,11

Links

David A. Corneth, Table of n, a(n) for n = 0..10000

Example

From David A. Corneth, Sep 09 2025: (Start)
a(1) = 0 as Fibonacci(1) = 0 which has 0 digits 5.
a(5) = 1 as Fibonacci(5) = 5 which has 1 digit 5.
a(10) = 2 as Fibonacci(10) = 55 which has 2 digits 5. (End)

Crossrefs

Cf. A000045, 0's A085854, 1's A085855, 2's A085856, 3's A085857, 4's A085858, 6's A085860, 7's A085861, 8's A085862, 9's A085863.

Sequence in context: A263717 A230279 A376366 * A218218 A332006 A086016

Adjacent sequences: A085856 A085857 A085858 * A085860 A085861 A085862

Keyword

nonn,easy,base

Author

Jason Earls, Jul 06 2003

Status

approved