cp's OEIS Frontend

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.

A139789 Numbers of primes < n-th-prime such that prime(n) + 4 is prime.

Table of values

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

List of values

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

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

Content is available under The OEIS End-User License Agreement.