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#19 by Susanna Cuyler at Tue Oct 05 10:59:10 EDT 2021
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#18 by Michel Marcus at Mon Oct 04 10:20:17 EDT 2021
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#17 by Michel Marcus at Mon Oct 04 10:20:10 EDT 2021
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| LINKS
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R. Zumkeller, <a href="/A070080/a070080.txt">Integer-sided triangles</a>
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| STATUS
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proposed
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#16 by Jean-François Alcover at Mon Oct 04 09:36:20 EDT 2021
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#15 by Jean-François Alcover at Mon Oct 04 09:36:11 EDT 2021
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| MATHEMATICA
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| STATUS
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approved
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#14 by N. J. A. Sloane at Mon Oct 09 00:03:48 EDT 2017
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#13 by Jon E. Schoenfield at Sun Oct 08 04:32:30 EDT 2017
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#12 by Jon E. Schoenfield at Sun Oct 08 04:32:23 EDT 2017
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| FORMULA
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a(n) = A051493(n)-A070094(n)-A070102(n).
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| EXAMPLE
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For n=30 there are A005044(30) = 19 integer triangles; only one is right: 5+12+13=30, 5^2+12^2 = 13^2; therefore a(30) = 1.
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| STATUS
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proposed
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#11 by Michel Marcus at Sun Oct 08 01:38:56 EDT 2017
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Discussion
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| Sun Oct 08
| 02:39
| Antti Karttunen: Yes. As usual, Zumkeller's formulas are often found from the Comments-section.
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#10 by Michel Marcus at Sun Oct 08 01:38:44 EDT 2017
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Discussion
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| Sun Oct 08
| 01:38
| Michel Marcus: ok like this ?
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