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A003829 Maximal number of unit circles through n points in plane, each circle containing 3 of the points. 0
1, 4, 4, 8, 12, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

REFERENCES

P. Erdős and G. Purdy, Extremal problems in combinatorial geometry, Chapter 17 in Handbook of Combinatorics, North-Holland '95, p. 848.

LINKS

Table of n, a(n) for n=3..8.

CROSSREFS

Sequence in context: A292276 A278083 A086663 * A194697 A194696 A302681

Adjacent sequences:  A003826 A003827 A003828 * A003830 A003831 A003832

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

The article by Erdős and Purdy incorrectly says (on p. 847) that each circle must contain a pair of the points.

STATUS

approved

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Last modified December 3 04:43 EST 2021. Contains 349445 sequences. (Running on oeis4.)