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Search: id:A068969
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| 6, 210, 528, 1680, 1800, 5304, 6930, 3150, 4650, 21000, 32760, 69342, 53550, 2170560, 2200200, 2501070, 646800, 4777080, 4796550, 11865840, 12243840, 12863760, 25070627, 18064200, 30510480
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Eric Weisstein's World of Mathematics, Heronian Triangle.
Eric Weisstein's World of Mathematics, Heron's Formula.
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EXAMPLE
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a(5) = 37: [37, A000040(37), A068968(5)] = [37,157,130], with s = (36+157+130)/2 = 162: Area^2 = s*(s-37)*(s-157)*(s-130) = 162*125*5*32 = 3240000 = 1800*1800, therefore a(5) = 1800.
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CROSSREFS
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Cf. A046131, A055595, A068966.
Sequence in context: A024083 A120436 A136742 this_sequence A094805 A055193 A001505
Adjacent sequences: A068966 A068967 A068968 this_sequence A068970 A068971 A068972
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Mar 30 2002
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