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May 26, 2015 at 4:33 answer added Lucia timeline score: 4
May 25, 2015 at 21:45 vote accept Dr. Pi
May 25, 2015 at 21:19 answer added so-called friend Don timeline score: 7
May 25, 2015 at 0:09 answer added Gerry Myerson timeline score: 9
May 24, 2015 at 23:59 comment added Dr. Pi Of course a suitably modulated question can be posed for $\tau_f(n):=\sum_{[f(d)]|n}1$, where $f:\mathbb{N}\to \mathbb{R}$ is any function, the previous example having $f(d)=d(d+1)$.
May 24, 2015 at 23:32 history asked Dr. Pi CC BY-SA 3.0