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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.

A173073 (n-th nonnegative nonprime) minus (n-1).

Table of values

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

List of values

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

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