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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.

A206369 a(p^k) = p^k - p^(k-1) + p^(k-2) - ... +- 1, and then extend by multiplicativity.

Table of values

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

List of values

[1, 1, 2, 3, 4, 2, 6, 5, 7, 4, 10, 6, 12, 6, 8, 11, 16, 7, 18, 12, 12, 10, 22, 10, 21, 12, 20, 18, 28, 8, 30, 21, 20, 16, 24, 21, 36, 18, 24, 20, 40, 12, 42, 30, 28, 22, 46, 22, 43, 21, 32, 36, 52, 20, 40, 30, 36, 28, 58, 24, 60, 30, 42, 43, 48, 20, 66, 48, 44, 24, 70, 35]

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