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A320997 An absolute lower bound on the number of components in perfect systems of difference sets (PSDS). 0
1, 3, 5, 6, 8, 10, 12, 13, 15, 17, 18 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

Abrham, J., and A. Kotzig. "Minimizing the number of components in perfect systems of difference sets." Congr. Numerantium, 47 (1985): 7-17. See Table 1, ceiling (h(c)).

LINKS

Table of n, a(n) for n=1..11.

CROSSREFS

Sequence in context: A139437 A233746 A299233 * A083042 A082977 A000210

Adjacent sequences:  A320994 A320995 A320996 * A320998 A320999 A321000

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 27 2018

STATUS

approved

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Last modified January 21 05:01 EST 2021. Contains 340333 sequences. (Running on oeis4.)