Let H_k=\sum_{i=1}^k \frac{1}{i} for all positive integers k. Find an closed-form expression for \sum_{k=1}^n H_k in terms of n and H_n.
Let H_k=\sum_{i=1}^k \frac{1}{i} for all positive integers k. Find an closed-form expression for \sum_{k=1}^n H_k in terms of n and H_n.