On numbers $n$ relatively prime to the $n$th term of a linear recurrence

Let $(u_n{)}_{n\ge 0}$ be a nondegenerate linear recurrence of integers, and let $\mathcal{A}$ be the set of positive integers $n$ such that $u_n$ and $n$ are relatively prime. We prove that $\mathcal{A}$ has an asymptotic density, and that this density is positive unless $(u_n\mathrm{/}n{)}_{n\ge 1}$ is a linear recurrence.