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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.

A069797 Smallest k>n such that phi(n) divides phi(k).

Table of values

n a(n)
1 2
2 3
3 4
4 5
5 8
6 7
7 9
8 10
9 13
10 12
11 22
12 13
13 21
14 18
15 16
16 17
17 32
18 19
19 27
20 24
21 26
22 25
23 46
24 30
25 33
26 28
27 37
28 35
29 58
30 32
31 61
32 34
33 41
34 40
35 39
36 37
37 57
38 54
39 45
40 48
41 55
42 45
43 49
44 50
45 52
46 67
47 94
48 51
49 86
50 55
51 64
52 56
53 106
54 57
55 75
56 65
57 63
58 87
59 118
60 64
61 77
62 77
63 73
64 68
65 97
66 75
67 134
68 80
69 89
70 72

List of values

[2, 3, 4, 5, 8, 7, 9, 10, 13, 12, 22, 13, 21, 18, 16, 17, 32, 19, 27, 24, 26, 25, 46, 30, 33, 28, 37, 35, 58, 32, 61, 34, 41, 40, 39, 37, 57, 54, 45, 48, 55, 45, 49, 50, 52, 67, 94, 51, 86, 55, 64, 56, 106, 57, 75, 65, 63, 87, 118, 64, 77, 77, 73, 68, 97, 75, 134, 80, 89, 72]

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

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