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.

A174031 The smallest integer k>0 such that the double-concatenation prime(n) // prime(n+1) // k is a prime number.

Table of values

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

List of values

[3, 3, 1, 19, 1, 1, 1, 1, 1, 1, 9, 11, 11, 17, 3, 1, 1, 3, 11, 17, 21, 19, 1, 7, 37, 7, 23, 37, 7, 1, 7, 7, 7, 11, 7, 33, 29, 31, 1, 13, 11, 17, 7, 11, 11, 9, 9, 1, 7, 7, 1, 13, 11, 19, 67, 1, 13, 21, 49, 13, 13, 1, 1, 23, 1, 1, 29, 1, 29, 7]

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

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