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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A355691 Dirichlet inverse of A320111, number of divisors of n that are not of the form 4k+2.

Table of values

n a(n)
1 1
2 -1
3 -2
4 -1
5 -2
6 2
7 -2
8 0
9 1
10 2
11 -2
12 2
13 -2
14 2
15 4
16 1
17 -2
18 -1
19 -2
20 2
21 4
22 2
23 -2
24 0
25 1
26 2
27 0
28 2
29 -2
30 -4
31 -2
32 1
33 4
34 2
35 4
36 -1
37 -2
38 2
39 4
40 0
41 -2
42 -4
43 -2
44 2
45 -2
46 2
47 -2
48 -2
49 1
50 -1
51 4
52 2
53 -2
54 0
55 4
56 0
57 4
58 2
59 -2
60 -4
61 -2
62 2
63 -2
64 0
65 4
66 -4
67 -2
68 2
69 4
70 -4
71 -2
72 0
73 -2
74 2
75 -2
76 2
77 4
78 -4
79 -2
80 -2
81 0
82 2
83 -2
84 -4
85 4
86 2
87 4
88 0
89 -2
90 2
91 4
92 2
93 4
94 2
95 4
96 -2
97 -2
98 -1
99 -2
100 -1
101 -2
102 -4
103 -2
104 0
105 -8

List of values

[1, -1, -2, -1, -2, 2, -2, 0, 1, 2, -2, 2, -2, 2, 4, 1, -2, -1, -2, 2, 4, 2, -2, 0, 1, 2, 0, 2, -2, -4, -2, 1, 4, 2, 4, -1, -2, 2, 4, 0, -2, -4, -2, 2, -2, 2, -2, -2, 1, -1, 4, 2, -2, 0, 4, 0, 4, 2, -2, -4, -2, 2, -2, 0, 4, -4, -2, 2, 4, -4, -2, 0, -2, 2, -2, 2, 4, -4, -2, -2, 0, 2, -2, -4, 4, 2, 4, 0, -2, 2, 4, 2, 4, 2, 4, -2, -2, -1, -2, -1, -2, -4, -2, 0, -8]

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