There are neat formulas, but those are just approximations, as an exact (closed form) is provably not possible. https://www.reddit.com/r/math/comments/8gw9on/i

There are neat formulas, but those are just approximations, as an exact (closed form) is provably not possible. https://www.reddit.com/r/math/comments/8gw9on/is_it_possible_to_find_a_closed_formula_for_the/ https://www.reddit.com/r/math/comments/8gw9on/is_it_possible... https://www.youtube.com/watch?v=5nW3nJhBHL0 https://www.youtube.com/watch?v=5nW3nJhBHL0