A280726 a(n) = A049501(phi(n)).

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

Offset: 1

Author

Indranil Ghosh, Jan 07 2017

Keywords

• nonn

Comments

a(n) = Major index (1st definition) of the total numbers <=n and prime to n i.e., phi(n).

Examples

			For n = 10, phi(n) = 4 and major index (1st definition) of 4 = 1. So a(n) = 1.
		

Links

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

Crossrefs

Cf. A000010, A049501, A280306, A280531.

Formula

a(n) = A049501(A000010(n)).