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A186926
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Maximal number of isosceles right triangles in a set of n points in the plane.
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2
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1, 4, 8, 11, 15, 20, 28, 35, 43, 52, 64, 74, 85, 97, 112, 124, 139, 156, 176, 192, 210, 229, 252, 271, 291, 314, 338, 363, 389, 417, 448, 473, 501, 531, 564, 594, 626, 659, 696, 728, 763, 799, 836, 874, 914, 955, 1000, 1038
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OFFSET
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3,2
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COMMENTS
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The values for n >= 15 are only conjectural.
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LINKS
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P. Erdős and G. Purdy, Some extremal problems in geometry III, Proc. 6th Southeastern Conference in Combinatorics, Graph Theory and Comp. (Florida Atlantic Univ., Boca Raton, Fla., 1975), pp. 291-308. Congressus Numerantium, No. XIV, Utilitas Math., Winnipeg, Man., 1975.
P. Erdős and G. Purdy, Some extremal problems in geometry IV., Proc. 7th Southeastern Conference in Combinatorics, Graph Theory and Comp. (Louisiana State Univ., Baton Rouge, La., 1976), pp. 3.
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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