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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.

A023240 Primes p such that 10*p + 9 is also prime.

Table of values

n a(n)
1 2
2 5
3 7
4 13
5 17
6 19
7 23
8 37
9 41
10 43
11 47
12 59
13 61
14 71
15 73
16 83
17 101
18 103
19 127
20 131
21 139
22 149
23 157
24 197
25 199
26 223
27 233
28 239
29 257
30 269
31 271
32 281
33 293
34 307
35 311
36 331
37 349
38 353
39 373
40 401
41 409
42 421
43 433
44 463
45 467
46 479
47 491
48 499
49 503
50 509
51 541
52 547
53 563
54 577
55 587
56 593
57 607
58 619

List of values

[2, 5, 7, 13, 17, 19, 23, 37, 41, 43, 47, 59, 61, 71, 73, 83, 101, 103, 127, 131, 139, 149, 157, 197, 199, 223, 233, 239, 257, 269, 271, 281, 293, 307, 311, 331, 349, 353, 373, 401, 409, 421, 433, 463, 467, 479, 491, 499, 503, 509, 541, 547, 563, 577, 587, 593, 607, 619]