A378443 Inverse Möbius transform of A372573.

1, 1, 1, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 3, 2, 2, 2, 4, 2, 4, 2, 2, 2, 2, 2, 4, 3, 3, 2, 2, 2, 3, 4, 4, 2, 2, 2, 4, 2, 2, 2, 3, 4, 4, 2, 2, 2, 4, 2, 4, 2, 2, 3, 2, 4, 4, 2, 4, 2, 2, 2, 4, 4, 2, 2, 4, 2, 4, 4, 2, 2, 2, 4, 4, 2, 3, 2, 3, 2, 4, 2, 4, 4

Offset: 1

Author

Antti Karttunen, Nov 27 2024

Keywords

• nonn

Comments

Number of terms of A339746 that divide n.

Links

• Antti Karttunen, Table of n, a(n) for n = 1..20000

Crossrefs

Cf. A339746, A372573.

Cf. also A174273, A378444.

Programs

PARI

A372573(n) = !((valuation(n, 2)-valuation(n, 3))%3);
A378443(n) = sumdiv(n,d,A372573(d));

Formula

a(n) = Sum_{d|n} A372573(d).