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Oct 6, 2010 at 4:31 vote accept John Stillwell
Oct 5, 2010 at 23:01 history edited Bjørn Kjos-Hanssen CC BY-SA 2.5
added 39 characters in body; added 215 characters in body
Oct 5, 2010 at 22:59 comment added Bjørn Kjos-Hanssen Alternatively, look at a tail of $\Omega$, namely $\{n: n+k\in\Omega\}$ where $k$ is large enough to take you beyond the finitely many exceptions.
Oct 5, 2010 at 22:56 comment added John Stillwell Thanks! This is the kind of thing I had in mind, but I couldn't get round the finitely many exceptions.
Oct 5, 2010 at 22:51 history answered Bjørn Kjos-Hanssen CC BY-SA 2.5