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A162194 Sum of divisors of nonprime number A018252(n). 3

%I

%S 1,7,12,15,13,18,28,24,24,31,39,42,32,36,60,31,42,40,56,72,63,48,54,

%T 48,91,60,56,90,96,84,78,72,124,57,93,72,98,120,72,120,80,90,168,96,

%U 104,127,84,144,126,96,144,195,114,124,140,96,168,186,121,126,224,108,132

%N Sum of divisors of nonprime number A018252(n).

%C Also, 1 together with the numbers A073255.

%H Harvey P. Dale, <a href="/A162194/b162194.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = A000203(A018252(n)).

%t Join[{1},DivisorSigma[1,#]&/@Select[Range[100],CompositeQ]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, May 27 2017 *)

%Y Cf. A000203, A018252, A073255, A162194, A162195.

%K easy,nonn

%O 1,2

%A _Omar E. Pol_, Jul 04 2009

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Last modified June 18 14:29 EDT 2021. Contains 345114 sequences. (Running on oeis4.)