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#16 by Harvey P. Dale at Sun Apr 15 15:33:58 EDT 2018
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#15 by Harvey P. Dale at Sun Apr 15 15:33:55 EDT 2018
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| MATHEMATICA
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Select[Range[800000], Divisible[DivisorSigma[11, #]-EulerPhi[#]^11, #]&] (* Harvey P. Dale, Apr 15 2018 *)
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| STATUS
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approved
editing
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#14 by Jon E. Schoenfield at Sat Mar 14 00:51:19 EDT 2015
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#13 by Jon E. Schoenfield at Sat Mar 14 00:51:17 EDT 2015
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| COMMENTS
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sigma_11(n) is the sum of the 11-th11th powers of the divisors of n (A013959).
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| STATUS
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approved
editing
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#12 by Joerg Arndt at Sun Mar 02 12:35:02 EST 2014
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#11 by Wesley Ivan Hurt at Sun Mar 02 11:51:46 EST 2014
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#10 by Wesley Ivan Hurt at Sun Mar 02 11:51:40 EST 2014
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#9 by Wesley Ivan Hurt at Sun Mar 02 11:51:29 EST 2014
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| MATHEMATICA
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Do[If[Mod[DivisorSigma[11, n]-EulerPhi[n]^11, n]==0, Print[n]], {n, 1, 10^5}]
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| CROSSREFS
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Cf. A000010.
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| STATUS
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proposed
editing
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#8 by Michel Marcus at Sun Mar 02 11:02:52 EST 2014
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#7 by Michel Marcus at Sun Mar 02 11:02:38 EST 2014
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| EXTENSIONS
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Definition corrected by and more terms from Michel Marcus, Mar 02 2014
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