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A004045 Minimal size of binary code of length n such that every vector is within distance 1 of at least 2 codewords. 0
2, 3, 4, 8, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Next 2 terms are 19 or 20, 32.

LINKS

Table of n, a(n) for n=1..5.

H. Hamalainen et al., Football pools - a game for mathematicians, Amer. Math. Monthly, 102 (1995), 579-588.

CROSSREFS

Sequence in context: A286224 A245388 A164573 * A064418 A171164 A283659

Adjacent sequences:  A004042 A004043 A004044 * A004046 A004047 A004048

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified March 21 09:59 EDT 2019. Contains 321368 sequences. (Running on oeis4.)