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 A058827 #11 Oct 19 2017 03:13:53 %S A058827 10,52,58,100,116,130,172,222,232,260,268,292,310,344,346,366,372,466, %T A058827 490,520,536,546,562,580,584,652,688,732,772,786,808,906,932,940,980, %U A058827 1018,1038,1068,1072,1108,1160,1168,1192,1210,1300,1332,1360,1372,1376 %N A058827 Totients which are not cototients. %H A058827 Donovan Johnson, <a href="/A058827/b058827.txt">Table of n, a(n) for n = 1..10000</a> %F A058827 Intersection(noncototients=A005278, A002202=totients). %e A058827 10, the smallest noncototient number, is the totient of 11. %Y A058827 Cf. A000010, A051953, A005277, A005278, A002020, A058763. %K A058827 nonn %O A058827 1,1 %A A058827 _Labos Elemer_, Jan 04 2001 %E A058827 More terms from _Don Reble_, Nov 28 2001 %E A058827 Offset corrected by _Donovan Johnson_, Nov 17 2013