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A055699 Numbers n such that n | (sigma_5(n) - phi(n)^5). 1

%I #15 Mar 02 2014 10:08:41

%S 1,2,12,34,44,90,168,258,752,765,954,1343,2795,3336,4114,4200,5964,

%T 6354,9118,11070,11504,11904,15800,20368,40070,48950,65670,91800,

%U 94240,144284,177120,226772,312675,334822,451350,518469,761780,804272,1092960,1448747,1815800

%N Numbers n such that n | (sigma_5(n) - phi(n)^5).

%C sigma_5(n) is the sum of the 5th powers of the divisors of n (A001160).

%H Robert G. Wilson v, <a href="/A055699/b055699.txt">Table of n, a(n) for n = 1..140</a>

%t Select[Range@ 200000, Mod[DivisorSigma[5, #] - EulerPhi[#]^5, #] == 0 &]

%K nonn

%O 1,2

%A _Robert G. Wilson v_, Jun 09 2000

%E Definition and formula corrected by _Robert G. Wilson v_, Mar 12 2013

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Last modified April 23 22:36 EDT 2024. Contains 371917 sequences. (Running on oeis4.)