cp's OEIS Frontend

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.

A172019 Numbers k such that 4 divides phi(k) (i.e., A000010(k)).

Table of values

n a(n)
1 5
2 8
3 10
4 12
5 13
6 15
7 16
8 17
9 20
10 21
11 24
12 25
13 26
14 28
15 29
16 30
17 32
18 33
19 34
20 35
21 36
22 37
23 39
24 40
25 41
26 42
27 44
28 45
29 48
30 50
31 51
32 52
33 53
34 55
35 56
36 57
37 58
38 60
39 61
40 63
41 64
42 65
43 66
44 68
45 69
46 70
47 72
48 73
49 74
50 75
51 76
52 77
53 78
54 80
55 82
56 84
57 85
58 87
59 88
60 89
61 90
62 91
63 92
64 93
65 95
66 96
67 97
68 99
69 100
70 101

List of values

[5, 8, 10, 12, 13, 15, 16, 17, 20, 21, 24, 25, 26, 28, 29, 30, 32, 33, 34, 35, 36, 37, 39, 40, 41, 42, 44, 45, 48, 50, 51, 52, 53, 55, 56, 57, 58, 60, 61, 63, 64, 65, 66, 68, 69, 70, 72, 73, 74, 75, 76, 77, 78, 80, 82, 84, 85, 87, 88, 89, 90, 91, 92, 93, 95, 96, 97, 99, 100, 101]