R(6,7) > 108

Construct a circulant graph on 108 vertices with vertices labeled with 0 to 107. For i > j, the edge joining i and j is colored in the first color if either i - j or 108 - (i - j) is one of the following values:

  3,  4,  6,  7,  9, 10, 14, 17, 20, 23
 25, 27, 29, 30, 32, 33, 34, 39, 40, 42
 43, 46, 47, 48

Otherwise the edge receives color two. There are no K6's in the first color and no K7's in the second color.

Geoff Exoo