MathDB
2021 LMT Spring Division A Problem 17

Source:

October 22, 2021

Problem Statement

Given that the value of k=12021112+22+32++k2+k=1101062k2k+k=10112021242k+1\sum_{k=1}^{2021} \frac{1}{1^2+2^2+3^2+\cdots+k^2}+\sum_{k=1}^{1010} \frac{6}{2k^2-k}+\sum_{k=1011}^{2021} \frac{24}{2k+1} can be expressed as mn\frac{m}{n}, where mm and nn are relatively prime positive integers, find m+nm+n.
Proposed by Aidan Duncan