Consider the following sum of function of primes: $$-\sum_{p}\ln\left( 1 - \frac{1}{(ep)^{1/2}} \right){\ln(p)}$$ Here $p$ runs through all primes and $e$ is Euler's constant. We can see that the sum diverges. I have following questions : >Is possible to regularize this sum ? >If yes, how to do so? Any advice about going around this is welcome. Any insights in such type of problems is/are also welcome. Related: https://mathoverflow.net/q/390472/174361 https://mathoverflow.net/q/385271/174361 I used the explicit formula for prime counting function $\pi(x)$ and integrated the given prime function with measure as $\pi(x)$. But i couldn't deduce an exact value. (If it is of any help, the answer I'm expecting is $(\gamma-3)$)