There are infinitely many integers $n$ such that $\varphi(n)=n/3$ prove or disprove the following statement:
There are infinitely many integers $n$ such that  $φ(n)=n/3$. where $φ(n)$ is Euler Phi-Function.
Could you please help me with the prove of this , I try it many time but I do not how can I start to prove it or disprove?.

Hint: Look at integers in the form $n = 2^a3^b$ where $a$ and $b$ are positive integers. Can you calculate $\varphi(n)$ for integers $n$ in that form?
