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A089630
Size of the smallest n-cluster.
0
1, 1, 4, 6, 56, 1275
OFFSET
1,3
COMMENTS
a(7) >= 20937. Points (x,y) of the smallest n-cluster for 1 < n < 7 : (0,0), (1,0); (0,0), (3,0), (0,4); (0,0), (3,4), (3,-4), (6,0); (0,0), (16,30), (-16,30), (0,-33), (56,0); (0,0), (546,272), (960,720), (132,720), (546,-1120), (1155,-540).
REFERENCES
N. Fardin and B. Langlois, "Ensembles du plan à distances mutuelles rationnelles", Quadrature, 39 (2000), p. 23.
LINKS
L. C. Noll and D. I. Bell, n-clusters for 1 < n < 7, Math. Comput., 53 (1989), pp. 439-444.
CROSSREFS
Sequence in context: A259133 A131847 A351733 * A058162 A244388 A132929
KEYWORD
nonn,more
AUTHOR
Philippe Deléham, Jan 03 2004
STATUS
approved