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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.

A035158 Floor of the Chebyshev function theta(n): a(n) = floor(Sum_{primes p <= n } log(p)).

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 3
6 3
7 5
8 5
9 5
10 5
11 7
12 7
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 22
30 22
31 26
32 26
33 26
34 26
35 26
36 26
37 29
38 29
39 29
40 29
41 33
42 33
43 37
44 37
45 37
46 37
47 40
48 40
49 40
50 40
51 40
52 40
53 44
54 44
55 44
56 44
57 44
58 44
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 61
72 61
73 65
74 65
75 65
76 65

List of values

[0, 0, 1, 1, 3, 3, 5, 5, 5, 5, 7, 7, 10, 10, 10, 10, 13, 13, 16, 16, 16, 16, 19, 19, 19, 19, 19, 19, 22, 22, 26, 26, 26, 26, 26, 26, 29, 29, 29, 29, 33, 33, 37, 37, 37, 37, 40, 40, 40, 40, 40, 40, 44, 44, 44, 44, 44, 44, 49, 49, 53, 53, 53, 53, 53, 53, 57, 57, 57, 57, 61, 61, 65, 65, 65, 65]

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