n
u
m
b
e
r
o
f
p
r
i
m
e
f
a
c
t
o
r
s
2
3
4
5
6
7
8
9
1
0
ζ
(
s
)
=
1
+
1
s
2
+
1
s
3
+
1
s
4
+
⋯
ζ
(
s
)
1
-
1
s
2
=
1
+
1
s
3
+
1
s
5
+
1
s
7
+
⋯
ζ
(
s
)
1
-
1
s
2
1
-
1
s
3
=
1
+
1
s
5
+
1
s
7
+
1
s
1
1
+
⋯