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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.

A057872 A version of the Chebyshev function theta(n): a(n) = round(Sum_{primes p <= n } log(p)).

Table of values

n a(n)
0 0
1 0
2 1
3 2
4 2
5 3
6 3
7 5
8 5
9 5
10 5
11 8
12 8
13 10
14 10
15 10
16 10
17 13
18 13
19 16
20 16
21 16
22 16
23 19
24 19
25 19
26 19
27 19
28 19
29 23
30 23
31 26
32 26
33 26
34 26
35 26
36 26
37 30
38 30
39 30
40 30
41 33
42 33
43 37
44 37
45 37
46 37
47 41
48 41
49 41
50 41
51 41
52 41
53 45
54 45
55 45
56 45
57 45
58 45
59 49
60 49
61 53
62 53
63 53
64 53
65 53
66 53
67 57
68 57
69 57
70 57
71 62
72 62
73 66
74 66
75 66
76 66

List of values

[0, 0, 1, 2, 2, 3, 3, 5, 5, 5, 5, 8, 8, 10, 10, 10, 10, 13, 13, 16, 16, 16, 16, 19, 19, 19, 19, 19, 19, 23, 23, 26, 26, 26, 26, 26, 26, 30, 30, 30, 30, 33, 33, 37, 37, 37, 37, 41, 41, 41, 41, 41, 41, 45, 45, 45, 45, 45, 45, 49, 49, 53, 53, 53, 53, 53, 53, 57, 57, 57, 57, 62, 62, 66, 66, 66, 66]

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