OlympiadBench / 1832 / Call a rational number short if it has finitely many digits in its decimal…

Call a rational number short if it has finitely many digits in its decimal expansion. For a positive integer m, we say that a positive integer t is m-tastic if there exists a number c∈{1,2,3,…,2017} such that (10^(t)−1)/(c⋅m) is short, and such that (10^(k)−1)/(c⋅m) is not short for any 1≤k<t. Let S(m) be the set of m-tastic numbers. Consider S(m) for m=1,2,… What is the maximum number of elements in S(m) ?

Call a rational number short if it has finitely many digits in its decimal expansion. For a positive integer $m$, we say that a positive integer $t$ is $m$-tastic if there exists a number $c \in\{1,2,3, \ldots, 2017\}$ such that $\frac{10^{t}-1}{c \cdot m}$ is short, and such that $\frac{10^{k}-1}{c \cdot m}$ is not short for any $1 \leqslant k<t$. Let $S(m)$ be the set of $m$-tastic numbers. Consider $S(m)$ for $m=1,2, \ldots$ What is the maximum number of elements in $S(m)$ ?