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A070202 Number of integer triangles with integer inradius, perimeter n and relatively prime side lengths. 2
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, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 3, 0, 0, 0, 1, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,60

REFERENCES

Mohammad K. Azarian, Circumradius and Inradius, Problem S125, Math Horizons, Vol. 15, Issue 4, April 2008, p. 32.  Solution published in Vol. 16, Issue 2, November 2008, p. 32.

LINKS

Table of n, a(n) for n=1..90.

Eric Weisstein's World of Mathematics, Incircle.

R. Zumkeller, Integer-sided triangles

CROSSREFS

Cf. A070138, A051493, A070109, A070209.

Sequence in context: A226369 A320751 A263764 * A280129 A227344 A130207

Adjacent sequences:  A070199 A070200 A070201 * A070203 A070204 A070205

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 05 2002

STATUS

approved

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Last modified November 16 17:25 EST 2018. Contains 317275 sequences. (Running on oeis4.)