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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.

A230203 Numbers k such that sigma(phi(k)) > k.

Table of values

n a(n)
1 5
2 7
3 9
4 11
5 13
6 17
7 19
8 21
9 23
10 25
11 26
12 27
13 29
14 31
15 33
16 35
17 37
18 38
19 39
20 41
21 43
22 45
23 47
24 49
25 51
26 52
27 53
28 55
29 56
30 57
31 59
32 61
33 62
34 63
35 65
36 67
37 69
38 71
39 73
40 74
41 75
42 76
43 77
44 79
45 81
46 82
47 83
48 85
49 86
50 87
51 88
52 89
53 91
54 93
55 95
56 97
57 99
58 101
59 103
60 104
61 105
62 107
63 109
64 111
65 112
66 113
67 115
68 116
69 117
70 119

List of values

[5, 7, 9, 11, 13, 17, 19, 21, 23, 25, 26, 27, 29, 31, 33, 35, 37, 38, 39, 41, 43, 45, 47, 49, 51, 52, 53, 55, 56, 57, 59, 61, 62, 63, 65, 67, 69, 71, 73, 74, 75, 76, 77, 79, 81, 82, 83, 85, 86, 87, 88, 89, 91, 93, 95, 97, 99, 101, 103, 104, 105, 107, 109, 111, 112, 113, 115, 116, 117, 119]

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

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