Revision History for A055703
(Underlined text is an addition;
strikethrough text is a deletion.)
Showing all changes.
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#10 by Joerg Arndt at Sun Mar 02 12:35:51 EST 2014
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#9 by Michel Marcus at Sun Mar 02 11:59:03 EST 2014
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#8 by Michel Marcus at Sun Mar 02 11:58:55 EST 2014
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| NAME
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Numbers n such that n | Sigmasigma_9(n) - Phiphi(n)^9.
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| STATUS
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proposed
editing
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#7 by Michel Marcus at Sun Mar 02 10:53:41 EST 2014
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#6 by Michel Marcus at Sun Mar 02 10:53:32 EST 2014
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| NAME
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Numbers n such that n | Sigma_9(n) + ) - Phi(n)^9.
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| COMMENTS
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sigma_9(n) is the sum of the 9th powers of the divisors of n. (A013957).
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| MATHEMATICA
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Do[If[Mod[DivisorSigma[9, n]+]-EulerPhi[n]^9, n]==0, Print[n]], {n, 1, 10^5}]
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| PROG
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(PARI) isok(n) = !((sigma(n, 9) - eulerphi(n)^9) % n); \\ Michel Marcus, Mar 02 2014
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| EXTENSIONS
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Definition corrected by Michel Marcus, Mar 02 2014
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| STATUS
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approved
editing
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#5 by Russ Cox at Fri Mar 30 17:30:21 EDT 2012
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| AUTHOR
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_Robert G. Wilson v (rgwv(AT)rgwv.com), _, Jun 09 2000
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Discussion
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| Fri Mar 30
| 17:30
| OEIS Server: https://oeis.org/edit/global/156
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#4 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006
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| MATHEMATICA
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Do[If[Mod[DivisorSigma[9, , n]+EulerPhi[n]^9, , n]==0, , Print[n]], {]], {n, , 1, , 10^5}]
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| KEYWORD
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nonn,new
nonn
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#3 by N. J. A. Sloane at Sat Jun 12 03:00:00 EDT 2004
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| NAME
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Numbers n such that n | Sigma_9(n) + Phi(n)^9.
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| KEYWORD
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nonn,new
nonn
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#2 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003
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| COMMENTS
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sigma_9(n) is the sum of the 9th powers of the divisors of n.
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| KEYWORD
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nonn,new
nonn
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| AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv@kspaint.com), Jun 09 2000
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#1 by N. J. A. Sloane at Thu Jun 15 03:00:00 EDT 2000
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| NAME
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n | Sigma_9(n) + Phi(n)^9.
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| DATA
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1, 2, 12, 54, 76, 90, 216, 423, 514, 531, 621, 2166, 2241, 2772, 2976, 4752, 5154, 5400, 5481, 6264, 7290, 7344, 9018, 9144, 9470, 9555, 14094, 14904, 19494, 21222, 23780, 25848, 28323, 34830, 34911, 38220, 40122, 48768, 49079, 55782, 59400
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| OFFSET
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1,2
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| MATHEMATICA
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Do[If[Mod[DivisorSigma[9, n]+EulerPhi[n]^9, n]==0, Print[n]], {n, 1, 10^5}]
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| KEYWORD
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nonn
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| AUTHOR
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Robert G. Wilson v (rgwv@kspaint.com), Jun 09 2000
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| STATUS
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approved
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