Given a number N we have to find the summation of all possible LCM(i,j) where i <= j <= N.
Constraints: N<=10^6 and total test case <= 10^5
Problem Link : Light OJ 1375
Summation of all pair of number's LCM(Lowest Common Multiple)
Given a number N we have to find the summation of all possible LCM(i,j) where i <= j <= N.
Constraints: N<=10^6 and total test case <= 10^5
Problem Link : Light OJ 1375