Convex Hull of Solutions for N = 28 .. 39listed at N.J.A Sloane's Web PageMinimum Edges: Gold. Other (longer) Edges: Blue | 
        
        
  | 
|          28;0.6734534  | 
                         29;0.6629006  | 
                         30;0.6609813  | 
                         31;0.6463457  | 
|          32;0.6424693  | 
                         33;0.6222578  | 
                         34;0.6148425  | 
                         35;0.6067327  | 
|          36;0.6045690  | 
                         37;0.5917897  | 
                         38;0.5889257  | 
                         39;0.5762095  | 
All Pictures Copyright © Hugo Pfoertner, 2001