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 A057852 Numbers n such that n | Sigma_2(n) + Sigma_1(n) + Sigma_0(n). 0

%I

%S 1,2,6,8,27,30,42,60,130,611,837,1196,7524,10640,14160,16836,43268,

%T 59856,83121,90960,317424,688704,718643,769101,4714800,11339016,

%U 15819208,25553726,37282080,53056400,97012042,190740298,403501008,2047926288

%N Numbers n such that n | Sigma_2(n) + Sigma_1(n) + Sigma_0(n).

%C sigma_0(n) is the number of divisors of n (A000005).

%C sigma_1(n) is the sum of the divisors of n [same as sigma(n)] (A000203).

%C sigma_2(n) is the sum of the squares of the divisors of n (A001157).

%t Do[ If[ Mod[ DivisorSigma[ 2, n] + DivisorSigma[ 1, n] + DivisorSigma[ 0, n], n] == 0, Print[n]], {n, 1, 10^7}]

%K nonn

%O 1,2

%A _Robert G. Wilson v_, Nov 10 2000

%E a(26)-a(34) from _Donovan Johnson_, Jun 08 2011

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Last modified April 5 20:21 EDT 2020. Contains 333260 sequences. (Running on oeis4.)