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 A024155 Number of integer-sided triangles with sides a,b,c, a
 0, 0, 0, 0, 0, 0, 0, 0, 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, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,60 COMMENTS Also number of right integer triangles with perimeter n having integral inradius. - Reinhard Zumkeller, May 05 2002 Every integer-sided right triangle has integer inradius. If the triple is [p^2-q^2,2pq,p^2+q^2] then inradius = pq-q^2. - Michael Somos, Sep 13 2005 LINKS Eric Weisstein's World of Mathematics, Incircle. Eric Weisstein's World of Mathematics, Right Triangle. R. Zumkeller, Integer-sided triangles FORMULA a(n) = A070201(n) - A070205(n) - A070206(n). CROSSREFS Sequence in context: A067898 A010106 A096159 * A173667 A086008 A083910 Adjacent sequences:  A024152 A024153 A024154 * A024156 A024157 A024158 KEYWORD nonn AUTHOR STATUS approved

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