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A070098 Number of integer triangles with perimeter n which are acute and isosceles. 6
0, 0, 1, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 2, 3, 3, 4, 3, 4, 4, 4, 4, 5, 4, 5, 5, 6, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 9, 10, 10, 11, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 14, 15, 15, 16, 15 (list; graph; refs; listen; history; internal format)
OFFSET

1,9

COMMENTS

a(n)=A070093(n)-A024154(n); a(n)=A059169(n)-A070106(n).

LINKS

R. Zumkeller, Integer-sided triangles

EXAMPLE

For n=9 there are A005044(9)=3 integer triangles: [1,4,4], [2,3,4] and [3,3,3]; both isosceles are also acute.

CROSSREFS

Cf. A070080, A070081, A070082, A059169, A070099, A070100, A070124.

Sequence in context: A086833 A010764 A029383 * A029233 A147981 A051888

Adjacent sequences:  A070095 A070096 A070097 * A070099 A070100 A070101

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.