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Search: id:A085432
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| A085432 |
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a(n) = number of triangles ABC with side lengths (n, m, p) such that n, m, p are integers, 1<=n<=m<=p, GCD(n, m, p) = 1, the Nagel point N of ABC lies on the incircle C(I, r). |
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+0
1
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| 1, 1, 1, 1, 2, 1, 2, 2, 3, 2, 5, 2, 6, 3, 4, 4, 8, 3, 9, 4, 6, 5, 11, 4
(list; graph; listen)
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OFFSET
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1,5
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COMMENT
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3*n = m + p
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EXAMPLE
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a(1) = 1; degenerate triangle (1, 1, 2).
a(2) = 1; triangle (2, 3, 3).
a(3) = 1; triangle (3, 4, 5).
a(4) = 1; triangle (4, 5, 7).
a(5) = 2; triangles (5, 6, 9) and (5, 7, 8).
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CROSSREFS
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Sequence in context: A127687 A024156 A075989 this_sequence A029169 A129193 A056812
Adjacent sequences: A085429 A085430 A085431 this_sequence A085433 A085434 A085435
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KEYWORD
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nonn,easy
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AUTHOR
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DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Aug 13, 2003
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