Cyclic Difference Sets (63, 31, 15)

Two sets exist


    0     1     2     3     4     6     7     8     9    12    13    14
   16    18    19    24    26    27    28    32    33    35    36    38
   41    45    48    49    52    54    56 

    0     1     2     3     4     5     6     8     9    10    12    16
   17    18    20    23    24    27    29    32    33    34    36    40
   43    45    46    48    53    54    58