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spoj Archives | forthright48 https://forthright48.com/tag/spoj/ learning never ends Thu, 22 Nov 2018 17:23:38 +0000 en-US hourly 1 https://wordpress.org/?v=6.5.8 SPOJ LCMSUM – LCM Sum https://forthright48.com/spoj-lcmsum-lcm-sum/?utm_source=rss&utm_medium=rss&utm_campaign=spoj-lcmsum-lcm-sum https://forthright48.com/spoj-lcmsum-lcm-sum/#comments Thu, 27 Aug 2015 06:46:00 +0000 Problem Problem Link – SPOJ LCMSUM Given $n$, calculate the sum $LCM(1,n) + LCM(2,n) + … + LCM(n,n)$, where $LCM(i,n)$ denotes the Least Common Multiple of the integers $i$ and $n$. Solution I recently solved this problem and found the solution really interesting. You can find the formula that solves this problem on OEIS. I …

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