A280800 - OEIS

A280800

a(n) = A049501(cototient(n)).

0, 0, 0, 1, 0, 1, 0, 1, 0, 2, 0, 1, 0, 1, 0, 1, 0, 2, 0, 2, 1, 2, 0, 1, 1, 3, 1, 1, 0, 5, 0, 1, 2, 5, 1, 2, 0, 4, 0, 2, 0, 4, 0, 2, 4, 2, 0, 1, 0, 4, 1, 3, 0, 5, 0, 1, 4, 4, 0, 5, 0, 1, 2, 1, 1, 6, 0, 5, 2, 6, 0, 2, 0, 6, 1, 4, 1, 7, 0, 2, 2, 9, 0, 4, 4, 5, 0, 2, 0, 7, 1, 2, 1, 2, 1, 1, 0, 3, 1, 4, 0, 7, 0, 3, 3, 7, 0, 5, 0

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OFFSET

1,10

COMMENTS

a(n) = major index (1st definition) of cototient(n), where cototient(n) = n - 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(A051953(n)).

EXAMPLE

For n = 10, A051953(n) = 6 and major index (1st definition) of 6 is 2. So, a(10) = 2.