id:A058211 - OEIS Search Results

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Numbers n such that there is an arrangement of n points in the plane such that no point is on >= n/2 connecting lines.

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9, 15, 19, 25, 31, 37 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Counterexamples to a conjecture of Dirac.`
	REFERENCES	`H. T. Croft, K. J. Falconer and R. K. Guy, Unsolved Problems in Geometry, F12.`
	CROSSREFS	`Sequence in context: A118236 A070876 A161163 this_sequence A038599 A079364 A160666` `Adjacent sequences: A058208 A058209 A058210 this_sequence A058212 A058213 A058214`
	KEYWORD	`nonn,nice,hard`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 30 2000`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.