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Sep 28, 2019 at 13:52 comment added WhatsUp Lol what a coincidence math.stackexchange.com/questions/3373058/mathematical-series
Sep 27, 2019 at 21:41 vote accept cupcake111680
Sep 27, 2019 at 21:41 vote accept cupcake111680
Sep 27, 2019 at 21:41
Sep 27, 2019 at 21:41 comment added cupcake111680 I was playing around with different summations involving the totient function, actually starting with the $g(n)$ one you mention, to see what they would yield. (I'm fascinated by the totient and mobius functions.) Your solution by the way is very elegant - thank you. I'm still curious though, if my above sum has a simple inclusion-exclusion/combinatorial interpretation...
Sep 27, 2019 at 17:12 history answered WhatsUp CC BY-SA 4.0