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a(n) = A049502(sigma(n)).
1

%I #7 Jan 10 2017 07:53:37

%S 0,0,0,0,0,0,0,0,1,2,0,0,0,0,0,0,2,3,3,6,0,3,0,0,0,6,4,0,0,4,0,0,0,3,

%T 0,7,3,0,0,7,6,0,4,8,4,4,0,0,1,6,4,2,3,0,4,0,5,7,0,10,0,0,4,0,8,5,3,0,

%U 0,5,4,2,6,2,0,4,0,10,5,8,1,0,8,0,4,3,0,9,7,6,0,10,0,5,0,0,2,12,5,6,3,5,4,7,0,8,4,5,4

%N a(n) = A049502(sigma(n)).

%C a(n) = major index (2nd definition) of the sum of the divisors of n, i.e., sigma(n).

%H Indranil Ghosh, <a href="/A280843/b280843.txt">Table of n, a(n) for n = 1..10000</a>

%H Indranil Ghosh, <a href="/A280843/a280843.txt">Python Program to generate the sequence</a>

%F a(n) = A049502(A000203(n)).

%e For n = 10, sigma(10) = 18 and major index (2nd definition) of 18 is 2. So, a(10) = 2.

%Y Cf. A049501, A000203, A280799, A280815.

%K nonn

%O 1,10

%A _Indranil Ghosh_, Jan 08 2017