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Jun 2, 2015 at 18:13 history edited Iosif Pinelis CC BY-SA 3.0
added to the previous version
Jun 2, 2015 at 17:19 comment added Iosif Pinelis I've struggled with the arithmetic for quite some time. :-) It looks like fedja's original construction works for $N\ge5$, but I don't know about $N=3,4$.
Jun 2, 2015 at 17:10 history edited Iosif Pinelis CC BY-SA 3.0
a correction
Jun 2, 2015 at 16:49 comment added Bill Johnson Oops! You are right, Iosif; my arithmetic was bad, not for the first time. :)
Jun 2, 2015 at 16:26 history answered Iosif Pinelis CC BY-SA 3.0