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Search: id:A097982
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| 864, 2430, 7776, 27000, 55296, 69984, 82134, 215622, 432000, 497664, 629856, 675000, 862488
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OFFSET
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1,1
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REFERENCES
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J.-M. De Koninck and A.Mercier, 1001 Problemes en Theorie Classique Des Nombres, Problem 749 pp. 95, 319, Ellipses Paris 2004.
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EXAMPLE
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For example: phi(864) = 288, sigma(864) = 2520, 864 = 2^5*3^3. (288+2520)/6^2 = 78.
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MATHEMATICA
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f[n_] := (DivisorSigma[1, n] + EulerPhi[n])/(Times @@ Transpose[FactorInteger[n]][[1]])^2; Do[ If[IntegerQ[f[n] && f[n] != 1], Print[n]], {n, 2, 1000000}] - Tanya Khovanova (tanyakh(AT)yahoo.com), Aug 30 2006
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CROSSREFS
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Sequence in context: A108822 A115749 A105323 this_sequence A064321 A082243 A114497
Adjacent sequences: A097979 A097980 A097981 this_sequence A097983 A097984 A097985
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KEYWORD
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more,nonn
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Sep 07 2004
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EXTENSIONS
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More terms from Tanya Khovanova (tanyakh(AT)yahoo.com), Aug 30 2006
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