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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.

A154966 Primes p such that the concatenation of p and prime(p) is composite.

Table of values

n a(n)
1 3
2 5
3 7
4 11
5 13
6 19
7 29
8 31
9 37
10 43
11 47
12 53
13 59
14 67
15 73
16 79
17 89
18 97
19 101
20 103
21 107
22 109
23 113
24 131
25 137
26 139
27 149
28 151
29 157
30 163
31 167
32 173
33 179
34 181
35 191
36 193
37 197
38 199
39 211
40 223
41 229
42 233
43 239
44 241
45 251
46 257
47 263
48 269
49 271
50 277
51 281
52 283
53 293
54 307
55 311
56 313
57 317

List of values

[3, 5, 7, 11, 13, 19, 29, 31, 37, 43, 47, 53, 59, 67, 73, 79, 89, 97, 101, 103, 107, 109, 113, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317]