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 2020-08-03, 14:14 #379 EdH     "Ed Hall" Dec 2009 Adirondack Mtns D2D16 Posts Welcome back, Jean-Luc! I hope you had a great time! You are correct about both merges. Now I have to find out why my program wasn't. I seem to recall correcting this already. Maybe I used an earlier (incorrect) version somehow. I stumbled around with a couple things in post 364 that might be of interest. I'm sure I don't have it written out properly, but I don't think the very last one is something that will actually turn up via data review, but it might just be a form of what you already found: Code: Additionally, that ai+1 is a factor of s(a(i*n)) (n, a positive even integer) Basically, if I have this correct, ai+1 will divide evenly, the Aliquot sum of a(i*n), if n is a positive even integer. Of course, I might be way off with something. Last fiddled with by EdH on 2020-09-17 at 14:17