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 A058825 #11 Nov 18 2013 03:09:18 %S A058825 1,2,4,6,8,12,16,18,20,22,24,28,30,32,36,40,42,44,46,48,54,56,60,64, %T A058825 66,70,72,78,80,82,84,88,92,96,102,104,106,108,110,112,120,126,128, %U A058825 132,136,138,140,144,148,150,156,160,162,164,166,168,176,178,180,184,190 %N A058825 Numbers which are both totients and cototients. %H A058825 Donovan Johnson, <a href="/A058825/b058825.txt">Table of n, a(n) for n = 1..10000</a> %F A058825 Intersection(A002202, A051953). %e A058825 24 is here because 24 = phi(72) = 44-phi(44) = 44-20 = cototient(44). %Y A058825 Cf. A000010, A051953, A005277, A005278, A002020, A058763. %K A058825 nonn %O A058825 1,2 %A A058825 _Labos Elemer_, Jan 04 2001 %E A058825 Offset corrected by _Donovan Johnson_, Nov 17 2013