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A339717 Dirichlet g.f.: Product_{k>=2} 1 / (1 + k^(-s))^2.

Table of values

n a(n)
1 1
2 -2
3 -2
4 1
5 -2
6 2
7 -2
8 -2
9 1
10 2
11 -2
12 0
13 -2
14 2
15 2
16 4
17 -2
18 0
19 -2
20 0
21 2
22 2
23 -2
24 4
25 1
26 2
27 -2
28 0
29 -2
30 2
31 -2
32 -4
33 2
34 2
35 2
36 2
37 -2
38 2
39 2
40 4
41 -2
42 2
43 -2
44 0
45 0
46 2
47 -2
48 -4
49 1
50 0
51 2
52 0
53 -2
54 4
55 2
56 4
57 2
58 2
59 -2
60 0
61 -2
62 2
63 0
64 5
65 2
66 2
67 -2
68 0
69 2
70 2
71 -2
72 -4
73 -2
74 2
75 0
76 0
77 2
78 2
79 -2
80 -4

List of values

[1, -2, -2, 1, -2, 2, -2, -2, 1, 2, -2, 0, -2, 2, 2, 4, -2, 0, -2, 0, 2, 2, -2, 4, 1, 2, -2, 0, -2, 2, -2, -4, 2, 2, 2, 2, -2, 2, 2, 4, -2, 2, -2, 0, 0, 2, -2, -4, 1, 0, 2, 0, -2, 4, 2, 4, 2, 2, -2, 0, -2, 2, 0, 5, 2, 2, -2, 0, 2, 2, -2, -4, -2, 2, 0, 0, 2, 2, -2, -4]

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