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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.

A303917 Number of ordered pairs of primes (p,q) such that p < q <= n and p*q > n.

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 3
6 2
7 5
8 5
9 5
10 4
11 8
12 8
13 13
14 12
15 11
16 11
17 17
18 17
19 24
20 24
21 23
22 22
23 30
24 30
25 30
26 29
27 29
28 29
29 38
30 38
31 48
32 48
33 47
34 46
35 45
36 45
37 56
38 55
39 54
40 54
41 66
42 66
43 79
44 79
45 79
46 78
47 92
48 92
49 92
50 92
51 91
52 91
53 106
54 106
55 105
56 105
57 104
58 103
59 119
60 119
61 136
62 135
63 135
64 135
65 134
66 134
67 152
68 152
69 151
70 151
71 170
72 170

List of values

[0, 0, 1, 1, 3, 2, 5, 5, 5, 4, 8, 8, 13, 12, 11, 11, 17, 17, 24, 24, 23, 22, 30, 30, 30, 29, 29, 29, 38, 38, 48, 48, 47, 46, 45, 45, 56, 55, 54, 54, 66, 66, 79, 79, 79, 78, 92, 92, 92, 92, 91, 91, 106, 106, 105, 105, 104, 103, 119, 119, 136, 135, 135, 135, 134, 134, 152, 152, 151, 151, 170, 170]

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

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