is base -4.) If you want to go ever further, think about what base \((1+\sqrt{5})/2\) (a.k.a. phinary ) would look like! Or the related bases Fibonacci and NegaFibonacci ! Share this: Twitter Facebook LinkedIn Reddit StumbleUpon Digg 1 Comment Ben Kraft says: November 29, 2011 at 12:37 pm You forgot base