A280843 a(n) = A049502(sigma(n)).

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, 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, 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

Offset: 1

Author

Indranil Ghosh, Jan 08 2017

Keywords

• nonn

Comments

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

Examples

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

Links

• Indranil Ghosh, Table of n, a(n) for n = 1..10000
• Indranil Ghosh, Python Program to generate the sequence

Crossrefs

Cf. A049501, A000203, A280799, A280815.

Formula

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