1. The problem statement, all variables and given/known data I have f(x) = the series x^k/[(k-1)k] summed from x=2 to infinity, and I need to find its closed form. Hint: What is the derivative of f(x) 2. Relevant equations None. 3. The attempt at a solution To start this problem, I took the derivative of the series, which makes the general term x^(k-1)/(k-1), which is x + x^2/2 + x^3/3... How do I get a function from this? I know this series looks really familiar, but I can't seem to remember where I've seen it before.