Express in terms of $n$:
$$\sum\limits_{k=1}^n \log\left(\phi(k)\right) \;\;\;\;\; – \; \sum\limits_{p \, \in \, primes} \log\left( \left(1 – \frac{1}{p} \right)^{\lfloor{\frac{n}{p}}\rfloor} \right)$$