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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.

A065680 Number of primes <= prime(n) which begin with a 1.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 1
6 2
7 3
8 4
9 4
10 4
11 4
12 4
13 4
14 4
15 4
16 4
17 4
18 4
19 4
20 4
21 4
22 4
23 4
24 4
25 4
26 5
27 6
28 7
29 8
30 9
31 10
32 11
33 12
34 13
35 14
36 15
37 16
38 17
39 18
40 19
41 20
42 21
43 22
44 23
45 24
46 25
47 25
48 25
49 25
50 25
51 25
52 25
53 25
54 25
55 25
56 25
57 25
58 25
59 25
60 25
61 25
62 25
63 25
64 25
65 25
66 25
67 25
68 25
69 25
70 25
71 25
72 25
73 25
74 25
75 25
76 25
77 25
78 25
79 25

List of values

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

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