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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.

A264810 Number of numbers k <= n such that phi(m) = k for some m.

Table of values

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

List of values

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

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

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