A070139 Number of isosceles integer triangles with perimeter n having integral area.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1

Offset

1,36

Comments

a(n) = A051516(n) - A024153(n).

Links

Seiichi Manyama, Table of n, a(n) for n = 1..1000

Eric Weisstein's World of Mathematics, Heronian Triangle.

R. Zumkeller, Integer-sided triangles

Crossrefs

Cf. A051516, A024153, A059169, A070145.

Sequence in context: A086080 A369054 A281477 * A116860 A179391 A332016

Adjacent sequences: A070136 A070137 A070138 * A070140 A070141 A070142

Keyword

nonn

Author

Reinhard Zumkeller, May 05 2002

Status

approved