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.

A304248 Numbers that yield a prime whenever a '3' is inserted between any two digits.

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 4
6 5
7 6
8 7
9 8
10 9
11 11
12 17
13 19
14 23
15 29
16 31
17 37
18 41
19 43
20 49
21 61
22 73
23 79
24 89
25 97
26 101
27 103
28 121
29 127
30 167
31 173
32 181
33 209
34 211
35 233
36 239
37 247
38 251
39 271
40 283
41 299
42 307
43 331
44 343
45 359
46 361
47 373
48 391
49 437
50 439
51 473
52 491
53 497
54 509
55 523
56 533
57 547
58 551
59 599

List of values

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 17, 19, 23, 29, 31, 37, 41, 43, 49, 61, 73, 79, 89, 97, 101, 103, 121, 127, 167, 173, 181, 209, 211, 233, 239, 247, 251, 271, 283, 299, 307, 331, 343, 359, 361, 373, 391, 437, 439, 473, 491, 497, 509, 523, 533, 547, 551, 599]