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A206415 Achromatic number of K_5 X K_n. 1
5, 6, 7, 10, 12, 15, 16, 18, 19, 22, 23, 25, 27, 29, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 49, 50, 52, 54, 55, 57, 58, 60, 61, 63, 64, 66, 67, 69, 71, 72, 74, 76 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

Hornak, Mirko and Pcola, Stefan, Achromatic number of K_5 X K_n for small n. Czechoslovak Math. J. 53 (128) (2003), no. 4, 963-988.

Hornak, Mirko and Pcola, Stefan, Achromatic number of K_5 X K_n for large n. Discrete Math. 234 (2001), no. 1-3, 159-169.

LINKS

Table of n, a(n) for n=1..42.

FORMULA

For n >= 43, a(n) = floor(9n/5).

CROSSREFS

Cf. A206416.

Sequence in context: A184804 A257604 A177089 * A162317 A162318 A108910

Adjacent sequences:  A206412 A206413 A206414 * A206416 A206417 A206418

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Feb 07 2012

STATUS

approved

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Last modified March 7 13:24 EST 2021. Contains 341886 sequences. (Running on oeis4.)