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
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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
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