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