1,10

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

Indranil Ghosh, Table of n, a(n) for n = 1..10000

Indranil Ghosh, Python Program to generate the sequence

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

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

Cf. A049501, A000203, A280799, A280815.

Sequence in context: A087780 A082523 A186034 * A221146 A083935 A053201

Adjacent sequences: A280840 A280841 A280842 * A280844 A280845 A280846

nonn

Indranil Ghosh, Jan 08 2017

approved