This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A192218 #28 May 17 2017 03:17:11 %S A192218 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26, %T A192218 27,28,29,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50, %U A192218 51,52,53,54,55,56,57,58,59,61,62,63,64,65,67,68,69,70,71,72,73,74,75,76,77 %N A192218 Numbers n such that the number of distinct prime divisors of n divides phi(n). %C A192218 Integers n where A001221(n) divides A000010(n). %H A192218 G. C. Greubel, <a href="/A192218/b192218.txt">Table of n, a(n) for n = 1..5000</a> %t A192218 Select[Range[2,100],Divisible[EulerPhi[#],PrimeNu[#]]&] (* _Harvey P. Dale_, May 06 2013 *) %o A192218 (PARI) for(n=2,1e3,if(eulerphi(n)%omega(n)==0,print1(n", "))) \\ _Charles R Greathouse IV_, Aug 17 2011 %Y A192218 Cf. A000010, A001221, A175785. %K A192218 nonn %O A192218 1,1 %A A192218 _Enrique Pérez Herrero_, Aug 06 2011