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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.

A203967 The number of positive integers <= n that have a prime number of divisors.

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 4
6 4
7 5
8 5
9 6
10 6
11 7
12 7
13 8
14 8
15 8
16 9
17 10
18 10
19 11
20 11
21 11
22 11
23 12
24 12
25 13
26 13
27 13
28 13
29 14
30 14
31 15
32 15
33 15
34 15
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 20
50 20
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 24
65 24
66 24
67 25
68 25
69 25

List of values

[0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 9, 10, 10, 11, 11, 11, 11, 12, 12, 13, 13, 13, 13, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 18, 18, 18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 22, 22, 23, 23, 23, 24, 24, 24, 25, 25, 25]

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

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