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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.

A036234 Number of primes <= n, if 1 is counted as a prime.

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

List of values

[1, 2, 3, 3, 4, 4, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 11, 11, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 18, 18, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20]

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

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