A070204 Number of isosceles integer triangles with perimeter n having integral inradius.

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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 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

Offset

1,108

Comments

a(n) = A070201(n) - A070203(n).

Links

Seiichi Manyama, Table of n, a(n) for n = 1..5000

Mohammad K. Azarian, Solution to Problem S125: Circumradius and Inradius, Math Horizons, Vol. 16, Issue 2, November 2008, p. 32.

Eric Weisstein's World of Mathematics, Incircle.

Eric Weisstein's World of Mathematics, Isosceles Triangle.

R. Zumkeller, Integer-sided triangles

Crossrefs

Cf. A070139, A059169.

Sequence in context: A353625 A322438 A304572 * A011745 A011744 A358754

Adjacent sequences: A070201 A070202 A070203 * A070205 A070206 A070207

Keyword

nonn

Author

Reinhard Zumkeller, May 05 2002

Status

approved