For a positive number $x$, let $f ( x )$ be the characteristic (integer part) of $\log x$. How many natural numbers $n$ not exceeding 100 satisfy $$f ( n + 10 ) = f ( n ) + 1$$ ? [4 points] (1) 11 (2) 13 (3) 15 (4) 17 (5) 19
For a positive number $x$, let $f ( x )$ be the characteristic (integer part) of $\log x$.
How many natural numbers $n$ not exceeding 100 satisfy
$$f ( n + 10 ) = f ( n ) + 1$$
? [4 points]\\
(1) 11\\
(2) 13\\
(3) 15\\
(4) 17\\
(5) 19