Can we prove the following statement ?
Let $\omega(m)$ denote the number of all distinct prime factors of a positive integer $m$.
Prove that every natural number $n$ can be written as $n=s-t$, where $s$ and $t$ are positive integers with $\omega(s)=\omega(t)$, in other words, as the difference of two positive integers with the same number of distinct prime factors.
If $n=1$ , we can choose $\ s=3\ $ and $\ t=2$.
If $n$ is even , we can choose $\ s=2n\ $ and $\ t=n$.