On Thu, Oct 21, 2010 at 10:26:30AM -0700, Andrew Weimholt wrote: > On 10/21/10, N. J. A. Sloane <njas at research.att.com> wrote: > > PS As sson as I posted that message, I found a solution: > > 1 3 3 1 3 3 1 3 3 ... > > 1, 2, 2, 2, 2, 2, 2, ... also works > x,y,y,y,y,y ... ?