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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.

A231773 Numbers k such that there are no numbers with k primitive roots.

Table of values

n a(n)
1 3
2 5
3 7
4 9
5 11
6 13
7 14
8 15
9 17
10 19
11 21
12 23
13 25
14 26
15 27
16 29
17 30
18 31
19 33
20 34
21 35
22 37
23 38
24 39
25 41
26 42
27 43
28 45
29 46
30 47
31 49
32 50
33 51
34 53
35 55
36 56
37 57
38 58
39 59
40 61
41 62
42 63
43 65
44 66
45 67
46 68
47 69
48 70
49 71
50 73
51 74
52 75
53 76
54 77
55 78
56 79
57 81
58 83
59 85
60 86
61 87
62 89
63 90
64 91
65 93
66 94
67 95

List of values

[3, 5, 7, 9, 11, 13, 14, 15, 17, 19, 21, 23, 25, 26, 27, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41, 42, 43, 45, 46, 47, 49, 50, 51, 53, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 81, 83, 85, 86, 87, 89, 90, 91, 93, 94, 95]

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

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