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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.

A366265 Dirichlet inverse of the sum of n/k over all prime powers k which divide n (including 1).

Table of values

n a(n)
1 1
2 -2
3 -2
4 0
5 -2
6 2
7 -2
8 0
9 -1
10 0
11 -2
12 2
13 -2
14 -2
15 -1
16 0
17 -2
18 2
19 -2
20 4
21 -3
22 -6
23 -2
24 2
25 -3
26 -8
27 -2
28 6
29 -2
30 12
31 -2
32 0
33 -7
34 -12
35 -5
36 4
37 -2
38 -14
39 -9
40 4
41 -2
42 18
43 -2
44 10
45 2
46 -18
47 -2
48 2
49 -5
50 -2
51 -13
52 12
53 -2
54 6
55 -9
56 6
57 -15
58 -24
59 -2
60 6
61 -2
62 -26
63 2
64 0
65 -11
66 30
67 -2
68 16
69 -19
70 16
71 -2
72 0
73 -2
74 -32
75 -4
76 18
77 -11
78 36
79 -2
80 4
81 -4
82 -36

List of values

[1, -2, -2, 0, -2, 2, -2, 0, -1, 0, -2, 2, -2, -2, -1, 0, -2, 2, -2, 4, -3, -6, -2, 2, -3, -8, -2, 6, -2, 12, -2, 0, -7, -12, -5, 4, -2, -14, -9, 4, -2, 18, -2, 10, 2, -18, -2, 2, -5, -2, -13, 12, -2, 6, -9, 6, -15, -24, -2, 6, -2, -26, 2, 0, -11, 30, -2, 16, -19, 16, -2, 0, -2, -32, -4, 18, -11, 36, -2, 4, -4, -36]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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