OFFSET
1,2
COMMENTS
First differs from A198634 (weakly perfect graphs) at a(8). The three 8-node graphs that have equal chromatic and fractional chromatic numbers but are not weakly perfect are the 4-antiprism graph and 50- and 84-Johnson solid skeleton graphs, all of which have clique number 3 but chromatic and fractional chromatic number 4.
LINKS
Eric Weisstein's World of Mathematics, Chromatic Number
Eric Weisstein's World of Mathematics, Fractional Chromatic Number
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, May 17 2017
STATUS
approved