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.

A032667 Digit '4' concatenated with a(n) is a prime.

Table of values

n a(n)
1 1
2 3
3 7
4 19
5 21
6 31
7 33
8 39
9 43
10 49
11 57
12 61
13 63
14 67
15 79
16 87
17 91
18 99
19 111
20 127
21 129
22 133
23 139
24 153
25 157
26 159
27 177
28 201
29 211
30 217
31 219
32 229
33 231
34 241
35 243
36 253
37 259
38 261
39 271
40 273
41 283
42 289
43 297
44 327
45 337
46 339
47 349
48 357
49 363
50 373
51 391
52 397
53 409

List of values

[1, 3, 7, 19, 21, 31, 33, 39, 43, 49, 57, 61, 63, 67, 79, 87, 91, 99, 111, 127, 129, 133, 139, 153, 157, 159, 177, 201, 211, 217, 219, 229, 231, 241, 243, 253, 259, 261, 271, 273, 283, 289, 297, 327, 337, 339, 349, 357, 363, 373, 391, 397, 409]