| 6, 12, 12, 24, 30, 24, 48, 36, 54, 48, 60, 60, 42, 84, 66, 84, 96, 108, 60, 120, 36, 90, 126, 108, 84, 60, 120, 150, 72, 96, 168, 120, 192, 132, 204, 210, 210, 84, 144, 216, 192, 240, 114, 156, 180, 120, 240, 300, 168, 210, 168
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(n) = A070086(A070142(n)).
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LINKS
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R. Zumkeller, Integer-sided triangles
Eric Weisstein's World of Mathematics, Heronian Triangle.
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EXAMPLE
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A070142(2)=39: [A070080(39), A070081(39), A070082(39)] = [5,5,6], area^2 = s*(s-5)*(s-5)*(s-6) with s=A070083(39)/2=(5+5+6)/2=8, area^2=8*3*3*2=16*9 is an integer square, therefore a(2)=A070086(39)=area=4*3=12.
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CROSSREFS
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Cf. A070142, A070210.
Sequence in context: A156386 A129858 A061928 this_sequence A055595 A132632 A063648
Adjacent sequences: A070146 A070147 A070148 this_sequence A070150 A070151 A070152
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 05 2002
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