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A070206 Number of obtuse integer triangles with perimeter n having integral inradius. 3
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 4, 0, 0, 0, 1, 0, 0 (list; graph; refs; listen; history; internal format)
OFFSET

1,84

COMMENTS

a(n) = A070201(n) - A024155(n) - A070205(n).

LINKS

R. Zumkeller, Integer-sided triangles

Eric Weisstein's World of Mathematics, Incircle.

Eric Weisstein's World of Mathematics, Obtuse Triangle.

CROSSREFS

Cf. A070141, A070101.

Sequence in context: A061859 A108708 A005925 * A136448 A128975 A152894

Adjacent sequences:  A070203 A070204 A070205 * A070207 A070208 A070209

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 05 2002

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.