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A011977
Covering numbers C(n,5,2).
3
1, 3, 3, 4, 5, 6, 7, 9, 10, 12, 13, 15, 16, 18, 19, 21, 21, 27, 28, 30, 30, 37, 38, 40
(list; graph; refs; listen; history; text; internal format)
OFFSET
5,2
COMMENTS
It is known that 42 <= a(29) <= 43. The next few values are known: a(30) = 48, a(31) = 50, a(32) = 52. - Nathaniel Johnston, Jan 10 2024
REFERENCES
CRC Handbook of Combinatorial Designs, 1996, p. 262.
LINKS
Table of n, a(n) for n=5..28.
D. Gordon, La Jolla Repository of Coverings
Uenal Mutlu (uenalm(AT)metronet.de), Tables of coverings
Index entries for covering numbers
CROSSREFS
Cf. A011975, A240116.
Sequence in context: A279400 A063197 A327226 * A104803 A104804 A240207
Adjacent sequences: A011974 A011975 A011976 * A011978 A011979 A011980
KEYWORD
nonn,hard
AUTHOR
N. J. A. Sloane.
EXTENSIONS
a(28) from Nathaniel Johnston, Jan 10 2024
STATUS
approved

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Last modified September 20 06:01 EDT 2024. Contains 376024 sequences. (Running on oeis4.)