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https://forthright48.com/spoj-lcmsum-lcm-sum/?utm_source=rss&utm_medium=rss&utm_campaign=spoj-lcmsum-lcm-sum learning never ends Mon, 02 Dec 2019 07:16:31 +0000 hourly 1 https://wordpress.org/?v=6.5.8 https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-173 Mon, 02 Dec 2019 07:16:31 +0000 #comment-173 Gorgeous]]> https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-167 Fri, 25 Oct 2019 02:53:32 +0000 #comment-167 https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-4 Tue, 28 Aug 2018 22:48:29 +0000 #comment-4
In the second summation, the summation goes over all possible d where d | n, including d = 1.

Since there is an extra d on second line (d=1), we subtract 1 from second line to keep it save value as first line.]]> https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-11 Tue, 28 Aug 2018 22:46:19 +0000 #comment-11 2(SUM−n)=n∑d|n,d≠1ϕ(d)×d ( when d=1, we get ϕ(1)×1 )

TO this:-
2(SUM−n)=n(∑d|n(ϕ(d)×d)−1)

basically i didn't understand where this -1 came from?

]]> https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-62 Mon, 08 Aug 2016 02:27:16 +0000 #comment-62 ]]> https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-73 Sat, 16 Jan 2016 02:31:14 +0000 #comment-73 https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-74 Sat, 16 Jan 2016 02:29:25 +0000 #comment-74 https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-77 Mon, 30 Nov 2015 12:52:53 +0000 #comment-77 https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-78 Thu, 12 Nov 2015 01:22:29 +0000 #comment-78 https://forthright48.com/spoj-lcmsum-lcm-sum/#comment-80 Thu, 12 Nov 2015 01:18:08 +0000 #comment-80