OFFSET
1,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = tau(n^8-1)-tau(n^4-1), with tau = A000005.
MAPLE
with(numtheory):
a:= n-> add(mobius(8/d) *tau(n^d-1), d={4, 8}):
seq(a(n), n=1..80);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 24 2012
STATUS
approved