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

1,7

Comments

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

Links

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

Indranil Ghosh, Python Program to generate the sequence

Formula

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

Example

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

Crossrefs

Cf. A000010, A049501, A280306, A280531.

Sequence in context: A333570 A363320 A351032 * A256607 A256608 A279186

Adjacent sequences: A280723 A280724 A280725 * A280727 A280728 A280729

Keyword

nonn

Author

Indranil Ghosh, Jan 07 2017

Status

approved