A348963 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A348963

a(n) is multiplicative with a(p^e) = Sum_{d|e} p^(e-d).

1, 1, 1, 3, 1, 1, 1, 5, 4, 1, 1, 3, 1, 1, 1, 13, 1, 4, 1, 3, 1, 1, 1, 5, 6, 1, 10, 3, 1, 1, 1, 17, 1, 1, 1, 12, 1, 1, 1, 5, 1, 1, 1, 3, 4, 1, 1, 13, 8, 6, 1, 3, 1, 10, 1, 5, 1, 1, 1, 3, 1, 1, 4, 57, 1, 1, 1, 3, 1, 1, 1, 20, 1, 1, 6, 3, 1, 1, 1, 13, 37, 1, 1, 3

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

COMMENTS

The function S_e(n) in Sándor (2006).

A number k is an exponential harmonic of type 2 (A348964) if and only if a(k) | k * A049419(k).

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

József Sándor, On exponentially harmonic numbers, Scientia Magna, Vol. 2, No. 3 (2006), pp. 44-47.

József Sándor, Selected Chapters of Geomety, Analysis and Number Theory, 2005, pp. 141-145.

FORMULA

a(n) = 1 if and only if n is squarefree (A005117).