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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.

A061091 Number of k with 1 <= k <= n relatively prime to phi(k).

Table of values

n a(n)
1 1
2 2
3 3
4 3
5 4
6 4
7 5
8 5
9 5
10 5
11 6
12 6
13 7
14 7
15 8
16 8
17 9
18 9
19 10
20 10
21 10
22 10
23 11
24 11
25 11
26 11
27 11
28 11
29 12
30 12
31 13
32 13
33 14
34 14
35 15
36 15
37 16
38 16
39 16
40 16
41 17
42 17
43 18
44 18
45 18
46 18
47 19
48 19
49 19
50 19
51 20
52 20
53 21
54 21
55 21
56 21
57 21
58 21
59 22
60 22
61 23
62 23
63 23
64 23
65 24
66 24
67 25
68 25
69 26
70 26
71 27
72 27
73 28
74 28
75 28

List of values

[1, 2, 3, 3, 4, 4, 5, 5, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 16, 16, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 21, 21, 21, 21, 21, 21, 22, 22, 23, 23, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 28]

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

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