2: 0.503179917313
    3: 0.643568348049
    4: 0.692960944306
    7: 0.770012848460
   19: 0.796479035795
   37: 0.804223450026
   55: 0.807528162139
   74: 0.812379020644
   82: 0.813507124491
   83: 0.817994223694
   84: 0.819345318069
  115: 0.819875129586
  116: 0.821163941818
  117: 0.822355202246
  120: 0.822428395169

2 3 4 7 19 37 55 74 82 83 84 115 116 117 120

Fit of radii by a power law r = a0*n^a1:
  a0 = 0.77670  a1 = -0.46922