  Let $x$ be a positive real number, and $\mathcal{P} \subset [2,\lambda(x)]$
be a set of primes, where $\lambda(x) \in \Omega(x^\varepsilon)$ is a monotone
increasing function with $\varepsilon \in (0,1)$. We examine
$Q_{\mathcal{P}}(x)$, where $Q_{\mathcal{P}}(x)$ is the element count of the
set containing those positive square-free integers, which are smaller than-, or
equal to $x$, and which are only divisible by the elements of $\mathcal{P}$.
