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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.

A226386 Numbers n such that rad(phi(n)) < phi(rad(n)), where rad(n) is the squarefree kernel of n, and phi is Euler's totient function.

Table of values

n a(n)
1 5
2 10
3 13
4 15
5 17
6 19
7 20
8 21
9 26
10 29
11 30
12 33
13 34
14 35
15 37
16 38
17 39
18 40
19 41
20 42
21 45
22 51
23 52
24 53
25 55
26 57
27 58
28 60
29 61
30 63
31 65
32 66
33 68
34 69
35 70
36 73
37 74
38 76
39 77
40 78
41 80
42 82
43 84
44 85
45 87
46 89
47 90
48 91
49 93
50 95
51 97
52 101
53 102
54 104
55 105
56 106
57 109
58 110
59 111
60 113
61 114
62 115

List of values

[5, 10, 13, 15, 17, 19, 20, 21, 26, 29, 30, 33, 34, 35, 37, 38, 39, 40, 41, 42, 45, 51, 52, 53, 55, 57, 58, 60, 61, 63, 65, 66, 68, 69, 70, 73, 74, 76, 77, 78, 80, 82, 84, 85, 87, 89, 90, 91, 93, 95, 97, 101, 102, 104, 105, 106, 109, 110, 111, 113, 114, 115]

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

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