

A085432


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).


0



1, 1, 1, 1, 2, 1, 2, 2, 3, 2, 5, 2, 6, 3, 4, 4, 8, 3, 9, 4, 6, 5, 11, 4
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OFFSET

1,5


COMMENTS

3*n = m + p.


LINKS

Table of n, a(n) for n=1..24.


EXAMPLE

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).


CROSSREFS

Sequence in context: A241312 A075989 A304714 * A029169 A202090 A241760
Adjacent sequences: A085429 A085430 A085431 * A085433 A085434 A085435


KEYWORD

nonn,easy


AUTHOR

Philippe Deléham, Aug 13 2003


STATUS

approved



