A244972 Orders of primitive groups not synchronizing a rank 3 map.

3, 9, 21, 27, 45, 81, 153, 243, 441, 495, 729

Offset

1,1

Comments

Also, orders of graphs with clique number and chromatic number 3 which have primitive automorphism groups.

Links

Table of n, a(n) for n=1..11.

Example

The graphs on 3^n vertices are the Hamming graphs over 3-letter alphabet; the graphs with 21, 45 and 153 vertices are the line graphs of the 6-cage, 8-cage, and Biggs-Smith graph respectively.

Crossrefs

Sequence in context: A251535 A191177 A275450 * A044055 A029542 A014962

Adjacent sequences: A244969 A244970 A244971 * A244973 A244974 A244975

Keyword

nonn,hard,more

Author

Peter J. Cameron, Nov 12 2014

Status

approved