A280799 a(n) = A049502(phi(n)).

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 3, 0, 3, 0, 2, 0, 0, 0, 0, 0, 3, 0, 0, 0, 3, 2, 0, 0, 4, 0, 6, 3, 0, 3, 4, 0, 6, 3, 0, 0, 3, 2, 4, 0, 3, 0, 2, 0, 0, 0, 3, 0, 0, 3, 2, 0, 4, 0, 3, 0, 4, 3, 4, 3, 0, 0, 4, 0, 3, 4, 7, 0, 0, 6, 0, 4, 5, 0, 4, 4, 0, 4, 4, 0, 0, 6, 0, 4, 3, 0, 3, 0, 0, 3, 6, 3, 4

Offset

1,11

Comments

a(n) = Major index (2nd 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) = A049502(A000010(n)).

Example

For n = 11, phi(n) = 10 and major index (2nd definition) of 10 = 2. So a(n) = 2.

Crossrefs

Cf. A000010, A049502, A279519, A280062, A280726.

Sequence in context: A062103 A112314 A350872 * A355860 A374089 A104261

Adjacent sequences: A280796 A280797 A280798 * A280800 A280801 A280802

Keyword

nonn

Author

Indranil Ghosh, Jan 08 2017

Status

approved