OFFSET
1,8
COMMENTS
a(n) depends only on prime signature of n (cf. A025487). So a(24) = a(375) since 24 = 2^3*3 and 375 = 3*5^3 both have prime signature (3,1).
LINKS
R. J. Mathar, Table of n, a(n) for n = 1..2519
FORMULA
Dirichlet g.f.: Product_{n in A026424} (1/(1-1/n^s)).
CROSSREFS
KEYWORD
nonn
AUTHOR
Christian G. Bower, Oct 15 1999
STATUS
approved