anchor.diff:  3125,6561
   6561,15625
   # 3D
  -63,67,65
  +# last dim is not combination of powers of 2,3,5,7
  +61,67,69
   126,127,129
   126,255,129
   255,254,259
  
positive.code: # 1D
  # not powers of 2,3,5 or 7
  265841
  1048577
  2097153
  
negative.code: 40353607
  129140163
  # 2D
  # last dim is not combination of powers of 2,3,5,7
  511,513
  1011,1013
  2047,2049
  