Question 11
Find the smallest natural number $n$ for which
$$\left\lfloor\frac{10^n}{x}\right\rfloor=1989$$
has an integer solution $x$. Here $\lfloor t\rfloor$ is the greatest integer at most $t$.
$$\left\lfloor\frac{10^n}{x}\right\rfloor=1989$$
has an integer solution $x$. Here $\lfloor t\rfloor$ is the greatest integer at most $t$.