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A055703
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Numbers n such that n | sigma_9(n) - phi(n)^9.
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0
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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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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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LINKS
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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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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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