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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.

A224980 Number of primes of the form p-q-1 where q is any prime < p = prime(n).

Table of values

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

List of values

[0, 0, 1, 1, 3, 2, 4, 4, 5, 4, 6, 8, 6, 8, 7, 6, 7, 12, 12, 10, 12, 14, 9, 8, 14, 12, 16, 11, 16, 14, 20, 14, 10, 16, 10, 24, 22, 20, 11, 12, 13, 28, 16, 22, 18, 26, 38, 22, 13, 24, 14, 18, 36, 18, 16, 17, 18, 38, 32, 28, 32, 16, 30, 24, 34, 20, 48, 38, 17]

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

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