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 A070141 Number of obtuse integer triangles with perimeter n having integral area. 3
 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, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 3, 0, 0, 0, 0, 0, 1, 0, 0, 0, 3, 0, 1, 0, 0, 0, 0, 0, 3, 0, 0, 0, 1, 0, 1, 0, 2, 0, 0, 0, 4, 0, 0, 0, 1, 0, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,36 COMMENTS a(n) = A051516(n) - A070140(n) - A024155(n). LINKS Eric Weisstein's World of Mathematics, Heronian Triangle. Eric Weisstein's World of Mathematics, Obtuse Triangle. R. Zumkeller, Integer-sided triangles CROSSREFS Cf. A051516, A070101, A070147. Sequence in context: A082786 A101638 A321379 * A088722 A122180 A033772 Adjacent sequences:  A070138 A070139 A070140 * A070142 A070143 A070144 KEYWORD nonn AUTHOR Reinhard Zumkeller, May 05 2002 STATUS approved

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Last modified June 5 15:37 EDT 2020. Contains 334852 sequences. (Running on oeis4.)