I agree the only positive side to list comprehension is just how consise it is and the speed of execution (it runs faster than traditional nested loops).

but I'm replying to the...soluion...itself? So i dont think spoiler flag is nessesary, unless there is a feature never heard about on code wars where we can look at solutions first

10/10 for dark magic sorcery, 1/10 for readability (and making me go blind). I don't allow this kind of sorcery in my projects btw. Now...I shall be on my way. Seriously though, I'm curious about the running time of this solution

Comments?

this is the best practice, it's a closed form solution. Mathematics studies paid off.

I tried to go technical by determining if the summation converged or not. Turned out it didnt. The summation sequence can be simplified, such that
it translates more gracefully to code. Math is very important.

at least your able to SEEE the test file in NASA (it makes sense that a programmer would have too), on here you cant

These tests are annoying, turns out they want a really general solution that covers every possible case and
avoids all the errors as much as possible