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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.

A072731 Difference of numbers of composite and prime numbers <= n.

Table of values

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

List of values

[0, -1, -2, -1, -2, -1, -2, -1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 14, 15, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 30, 31, 30, 31, 32, 33, 34]

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

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