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A085861

Number of 7's in decimal expansion of Fibonacci(n).

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,15

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) = 1 which has 0 digits 7.

a(16) = 1 as Fibonacci(16) = 987 which has 1 digit 7.

a(14) = 2 as Fibonacci(14) = 377 which has 2 digits 7. (End)

MATHEMATICA

DigitCount[Fibonacci[Range[0, 110]], 10, 7] (* Harvey P. Dale, Jul 11 2020 *)