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 A073465 #9 Apr 11 2020 15:49:44 %S A073465 2,3,4,8,10,11,13,14,20,27,37,39,43,63,90,91,95,122,124,136,152,169, %T A073465 175,176,224,322,364,365,410,460,605,875,917,1082,1084,1085,1086,1087, %U A073465 1137,1143,1164,1168,1444,1517,1541,1751,1786,1991,2873,3087,3101,3283 %N A073465 Numbers n such that phi(n)/pi(n) is an integer. %H A073465 Donovan Johnson, <a href="/A073465/b073465.txt">Table of n, a(n) for n = 1..1000</a> %F A073465 Mod[A000010(n), A000720(n)]=A071259[n]=0 %t A073465 Select[Range[2,3300],IntegerQ[EulerPhi[#]/PrimePi[#]]&] (* _Harvey P. Dale_, Apr 11 2020 *) %Y A073465 Cf. A000010, A000720, A073464. %K A073465 nonn %O A073465 1,1 %A A073465 _Labos Elemer_, Aug 02 2002