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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.

A132857 a(0)=1. a(n) = phi(n+a(n-1)), for n>=1, where phi(m) is the number of positive integers which are <= m and are coprime to m.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 4
5 6
6 4
7 10
8 6
9 8
10 6
11 16
12 12
13 20
14 16
15 30
16 22
17 24
18 12
19 30
20 20
21 40
22 30
23 52
24 36
25 60
26 42
27 44
28 24
29 52
30 40
31 70
32 32
33 48
34 40
35 40
36 36
37 72
38 40
39 78
40 58
41 60
42 32
43 40
44 24
45 44
46 24
47 70
48 58
49 106
50 48
51 60
52 48
53 100
54 60
55 88
56 48
57 48
58 52
59 72
60 40
61 100
62 54
63 72
64 64
65 84
66 40
67 106
68 56
69 100

List of values

[1, 1, 2, 4, 4, 6, 4, 10, 6, 8, 6, 16, 12, 20, 16, 30, 22, 24, 12, 30, 20, 40, 30, 52, 36, 60, 42, 44, 24, 52, 40, 70, 32, 48, 40, 40, 36, 72, 40, 78, 58, 60, 32, 40, 24, 44, 24, 70, 58, 106, 48, 60, 48, 100, 60, 88, 48, 48, 52, 72, 40, 100, 54, 72, 64, 84, 40, 106, 56, 100]

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