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.

A050714 Inserting a digit '4' between adjacent digits of n makes a prime.

Table of values

n a(n)
1 19
2 21
3 37
4 39
5 43
6 49
7 51
8 57
9 61
10 63
11 67
12 73
13 91
14 97
15 113
16 119
17 123
18 129
19 131
20 137
21 147
22 149
23 153
24 159
25 171
26 177
27 183
28 197
29 203
30 209
31 227
32 243
33 257
34 279
35 281
36 287
37 293
38 311
39 317
40 353
41 359
42 369
43 377
44 381
45 383
46 387
47 389
48 399
49 401
50 429
51 449
52 453
53 459
54 461
55 467

List of values

[19, 21, 37, 39, 43, 49, 51, 57, 61, 63, 67, 73, 91, 97, 113, 119, 123, 129, 131, 137, 147, 149, 153, 159, 171, 177, 183, 197, 203, 209, 227, 243, 257, 279, 281, 287, 293, 311, 317, 353, 359, 369, 377, 381, 383, 387, 389, 399, 401, 429, 449, 453, 459, 461, 467]