Revision History for A123074
(Underlined text is an addition;
strikethrough text is a deletion.)
Showing entries 1-10
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#16 by N. J. A. Sloane at Sun Jul 23 21:47:25 EDT 2017
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#15 by Antti Karttunen at Sun Jul 23 16:29:19 EDT 2017
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#14 by Antti Karttunen at Sun Jul 23 16:28:38 EDT 2017
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| COMMENTS
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For distinct primes p, q and r, a(p^3) = 1, a(p^2 q) = 3, a(pqr) = 6, otherwise (when A101605(n) = 0), a(n) = 0.. - Comment clarified by _David A. Corneth_ and _Antti Karttunen_, Jul 23 2017
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#13 by David A. Corneth at Sun Jul 23 16:20:05 EDT 2017
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Discussion
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| Sun Jul 23
| 16:26
| Antti Karttunen: I think comment beginning with "For distinct primes p, q and r," is meant to clarify what kind of cases of non-distinct triples may occur.
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| 16:27
| Antti Karttunen: (Ah, yes, David added that distinct clarification, I thought it was there from the beginning).
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#12 by David A. Corneth at Sun Jul 23 16:19:17 EDT 2017
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| COMMENTS
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For distinct primes p, q and r, a(p^3) = 1, a(p^2 q) = 3, a(pqr) = 6, otherwise (when A101605(n) = 0), a(n) = 0.
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Discussion
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| Sun Jul 23
| 16:19
| David A. Corneth: Name uses p, q and r as not necessarily distinct primes, the comment does.
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#11 by Michel Marcus at Sun Jul 23 15:58:30 EDT 2017
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#10 by Michel Marcus at Sun Jul 23 15:58:24 EDT 2017
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| MATHEMATICA
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Join[{0}, Table[e=Sort[Transpose[FactorInteger[n]][[2]]]; Which[e=={3}, 1, e=={1, 2}, 3, e=={1, 1, 1}, 6, True, 0], {n, 2, 150}]] - _}]] (* _T. D. Noe_, Sep 29 2006 *)
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#9 by Antti Karttunen at Sun Jul 23 15:57:31 EDT 2017
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#8 by Antti Karttunen at Sun Jul 23 15:55:38 EDT 2017
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#7 by Antti Karttunen at Sun Jul 23 15:53:22 EDT 2017
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