So, is it possible to create a Gray code sequence for any non-power-of-2 number (so long as it is an even number)? Let us see. . . I'm sure someone will have a more formal proof, but logically you can ...

Our friend says that he believes that it is possible to create a Gray code sequence for any non-power-of-2 number (so long as it is an even number), but that he has not been able to track down any ...