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.

A032623 Numbers k such that k concatenated with k+8 is a prime.

Table of values

n a(n)
1 1
2 3
3 13
4 15
5 21
6 39
7 49
8 55
9 69
10 75
11 91
12 111
13 115
14 159
15 163
16 165
17 169
18 171
19 183
20 193
21 195
22 199
23 201
24 205
25 211
26 229
27 235
28 241
29 249
30 265
31 271
32 273
33 289
34 291
35 309
36 313
37 319
38 321
39 325
40 331
41 333
42 349
43 351
44 355
45 363
46 379
47 381
48 385
49 391
50 393
51 405
52 423
53 441
54 445

List of values

[1, 3, 13, 15, 21, 39, 49, 55, 69, 75, 91, 111, 115, 159, 163, 165, 169, 171, 183, 193, 195, 199, 201, 205, 211, 229, 235, 241, 249, 265, 271, 273, 289, 291, 309, 313, 319, 321, 325, 331, 333, 349, 351, 355, 363, 379, 381, 385, 391, 393, 405, 423, 441, 445]