A004044 - OEIS

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A004044

Size of minimal covering code in {Z_3}^n with covering radius 1 (the next 3 terms are in the ranges 71-73, 156-186, 402-486).

1, 3, 5, 9, 27 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	REFERENCES	`G. D. Cohen et al., Covering Codes, North-Holland, 1997, p. 174.` `H. Hamalainen et al., Football pools - a game for mathematicians, Amer. Math. Monthly, 102 (1995), 579-588.`
	LINKS	`G. Keri, Tables for Bounds on Covering Codes` `Index entries for sequences related to covering codes`
	CROSSREFS	`A column of A060439.` `Sequence in context: A114001 A171879 A171877 * A192152 A082711 A013622` `Adjacent sequences: A004041 A004042 A004043 * A004045 A004046 A004047`
	KEYWORD	`nonn,hard`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`Bounds corrected and corresponding reference added by Jan Kristian Haugland (admin(AT)neutreeko.net), Mar 10 2010`

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Last modified February 15 05:45 EST 2012. Contains 205694 sequences.