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%I #15 Feb 18 2021 11:04:49
%S 1,2,3,6,12,14,15,30,35,42,56,70,78,105,140,168,190,210,235,248,264,
%T 270,329,357,418,420,470,570,594,616,630,658,695,705,714,744,799,807,
%U 812,840,910,940,987,1045,1240,1254,1316,1390,1410,1485,1529
%N Numbers k such that phi(k) | sigma_11(k).
%C sigma_11(n) = A013959(n) is the sum of the 11th powers of the divisors of n.
%H Amiram Eldar, <a href="/A015769/b015769.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from Harvey P. Dale)
%t Select[Range[2000],Divisible[DivisorSigma[11,#],EulerPhi[#]]&] (* _Harvey P. Dale_, Feb 07 2015 *)
%Y Cf. A000010, A013959.
%Y Cf. A020492, A015759, A015761, A015762, A015763, A015764, A015765, A015766, A015767, A015768, A015770, A015771, A015773, A015774, A094470.
%K nonn
%O 1,2
%A _Robert G. Wilson v_
%E Offset corrected by _Amiram Eldar_, Nov 02 2019
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