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 A280815 #5 Jan 10 2017 07:52:45 %S A280815 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,1,0,0,3,0,0,1,2, %T A280815 2,0,0,3,0,0,0,0,0,0,4,0,0,0,0,0,2,0,0,3,0,0,4,0,0,4,0,0,2,0,1,4,0,3, %U A280815 1,4,0,0,0,3,2,4,1,3,0,0,2,6,0,0,4,4,0,0,0,2,2,0,1,0,3,0,0,0,3,0,0,3,0,0,1,3,0,4,0 %N A280815 a(n) = A049502(cototient(n)). %C A280815 a(n) = major index (2nd definition) of cototient(n), where cototient(n) = n - phi(n). %H A280815 Indranil Ghosh, <a href="/A280815/b280815.txt">Table of n, a(n) for n = 1..10000</a> %H A280815 Indranil Ghosh, <a href="/A280815/a280815.txt">Python Program to generate the sequence</a> %F A280815 a(n) = A049502(A051953(n)). %e A280815 For n = 30, cototient(n) = 22 and major index (2nd definition) of 22 is 3. So, a(n) = 3. %Y A280815 Cf. A049502, A051953, A280726, A280799, A280800. %K A280815 nonn %O A280815 1,30 %A A280815 _Indranil Ghosh_, Jan 08 2017