Duplicate hunting

Don Reble djr at nk.ca
Wed Apr 11 01:58:09 CEST 2007

    I'm interested in the triplicate A051913, A066962, A067020.
    (See also A125866.)
    Can someone please explain what "constructed using conics" means?
Don Reble  djr at nk.ca

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are "biconnected graphs on n nodes with chromatic number 2"


"biconnected triangle-free graphs on n nodes with chromatic number 2"

Therefore they are necessarily duplicates seeing chromatic number 2  
forces triangle-free...

Associate Professor Gordon Royle
Department of Computer Science & Software Engineering
University of Western Australia

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