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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.

A062570 a(n) = phi(2*n).

Table of values

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

List of values

[1, 2, 2, 4, 4, 4, 6, 8, 6, 8, 10, 8, 12, 12, 8, 16, 16, 12, 18, 16, 12, 20, 22, 16, 20, 24, 18, 24, 28, 16, 30, 32, 20, 32, 24, 24, 36, 36, 24, 32, 40, 24, 42, 40, 24, 44, 46, 32, 42, 40, 32, 48, 52, 36, 40, 48, 36, 56, 58, 32, 60, 60, 36, 64, 48, 40, 66, 64, 44, 48, 70, 48, 72]

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

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