OFFSET
1,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = tau(n^10-1)-tau(n^5-1)-tau(n^2-1)+tau(n-1), with tau = A000005.
MAPLE
with(numtheory):
a:= n-> add(mobius(10/d) *tau(n^d-1), d={1, 2, 5, 10}):
seq(a(n), n=1..80);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 24 2012
STATUS
approved