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%I #16 Aug 31 2018 02:53:59
%S 3,7,15,22,23,30,35,44,47,51,56,71,88,95,135,140,153,155,167,207,239,
%T 263,280,310,311,368,383,385,395,431,503,506,599,635,646,647,658,719,
%U 839,887,911,920,995,1012,1023,1045,1078,1080,1103,1131,1185,1223,1309
%N Numbers k such that phi(k + 5) | sigma(k).
%H Vincenzo Librandi, <a href="/A015821/b015821.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[10000], Divisible[DivisorSigma[1, #], EulerPhi[5 + #]] &] (* _David Nacin_, Mar 01 2012 *)
%K nonn
%O 1,1
%A _Robert G. Wilson v_
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