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Aug 10, 2014 at 4:31 comment added Fred Daniel Kline Actually, it is not a counter-example. See modified OP. $2193$ is a multiple of 17, inside the 17-seg which shows it is a derangement.
Jan 21, 2013 at 11:42 vote accept Fred Daniel Kline
Aug 10, 2014 at 7:09
Jan 21, 2013 at 11:42 comment added Fred Daniel Kline +1, Nice counter-example! We still have palindromic list for 13, which means we have two ranges of that size. I'll try to drop the second requirement to see where that heads. I'm not too optimistic.
Jan 21, 2013 at 11:11 history answered Gerry Myerson CC BY-SA 3.0