A359635 a(n) = A162657(n)/n.

1, 1, 1, 1, 1, 3, 1, 1, 1, 2, 1, 4, 1, 8, 3, 1, 1, 26, 1, 24, 1, 4, 1, 3, 1, 2, 1, 7, 1, 6, 1, 1, 3, 2, 1, 1, 1, 4, 1, 2, 1, 32, 1, 4, 18, 8, 1, 4, 1, 1, 9, 2, 1, 3, 1, 8, 1, 2, 1, 156, 1, 32, 1, 1, 1, 312, 1, 2, 3, 14, 1, 26, 1, 2, 1, 4, 1, 8, 1, 2, 1, 2, 1, 21, 1, 4, 3, 4, 1, 792

Offset: 1

Author

Michel Marcus, Jan 09 2023

Keywords

• nonn

Comments

A162657(n) is the least k such that denominator(sigma(k)/k) = n, so it is divisible by n.

Links

• Michel Marcus, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A162657.

Programs

PARI

a(n) = my(k=1); while (denominator(sigma(k)/k) != n, k++); k/n;