Number of Fibonacci Numbers with Same Number of Decimal Digits/Mistake

Source Work

 * The Dictionary
 * $5$
 * $5$

Mistake

 * The number of Fibonacci numbers having the same number of digits is either $4$ or $5$.

Correction
There is a notable exception: there are $6$ (or $7$ if you include $F_0 = 0$) Fibonacci numbers with $1$ digit:
 * $1, 1, 2, 3, 5, 8$