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Oct 17, 2015 at 13:33 comment added Joseph O'Rourke Now I wonder if, permitting translation of $P_n$ as well as rotation, one can achieve intersections with a number of sides equal to every integer from $3$ to $2k$. But that is for a (possible) future question...
Oct 17, 2015 at 2:05 vote accept Joseph O'Rourke
Oct 17, 2015 at 1:37 comment added Joseph O'Rourke Neat! Always just two integers repeated.
Oct 17, 2015 at 1:18 history answered Gjergji Zaimi CC BY-SA 3.0