OFFSET
1,2
COMMENTS
Not multiplicative because A344695 isn't either. For example, a(4) = -2, a(27) = 3, but a(108) = -2 != -6.
The absolute values are not equal to A007947. The first n where abs(a(n)) != A007947(n) is at n=108, with a(108) = -2, while A007947(108) = 6.
The first n such that a(n) does not divide n are: 196, 216, 392, 432, 441, 588, etc.
The zeros occur at n = 288, 576, 1440, 2016, 2880, 3168, 3744, 4032, etc.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
PROG
CROSSREFS
KEYWORD
sign
AUTHOR
Antti Karttunen, Aug 25 2021
STATUS
approved