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.

A231507 a(n) is smallest number greater than a(n-1) such that a(n)+a(n-1) is composite.

Table of values

n a(n)
1 4
2 5
3 7
4 8
5 10
6 11
7 13
8 14
9 16
10 17
11 18
12 20
13 22
14 23
15 25
16 26
17 28
18 29
19 31
20 32
21 33
22 35
23 37
24 38
25 39
26 41
27 43
28 44
29 46
30 47
31 48
32 50
33 52
34 53
35 55
36 56
37 58
38 59
39 60
40 61
41 62
42 63
43 65
44 67
45 68
46 70
47 71
48 72
49 73
50 74
51 76
52 77
53 78
54 80
55 81
56 83
57 85
58 86
59 88
60 89
61 91
62 92
63 93
64 94
65 95
66 97

List of values

[4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 18, 20, 22, 23, 25, 26, 28, 29, 31, 32, 33, 35, 37, 38, 39, 41, 43, 44, 46, 47, 48, 50, 52, 53, 55, 56, 58, 59, 60, 61, 62, 63, 65, 67, 68, 70, 71, 72, 73, 74, 76, 77, 78, 80, 81, 83, 85, 86, 88, 89, 91, 92, 93, 94, 95, 97]

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

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