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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.

A370008 a(n) is the greatest prime less than 3*prime(n).

Table of values

n a(n)
1 5
2 7
3 13
4 19
5 31
6 37
7 47
8 53
9 67
10 83
11 89
12 109
13 113
14 127
15 139
16 157
17 173
18 181
19 199
20 211
21 211
22 233
23 241
24 263
25 283
26 293
27 307
28 317
29 317
30 337
31 379
32 389
33 409
34 409
35 443
36 449
37 467
38 487
39 499
40 509
41 523
42 541
43 571
44 577
45 587
46 593
47 631
48 661
49 677
50 683
51 691
52 709
53 719
54 751

List of values

[5, 7, 13, 19, 31, 37, 47, 53, 67, 83, 89, 109, 113, 127, 139, 157, 173, 181, 199, 211, 211, 233, 241, 263, 283, 293, 307, 317, 317, 337, 379, 389, 409, 409, 443, 449, 467, 487, 499, 509, 523, 541, 571, 577, 587, 593, 631, 661, 677, 683, 691, 709, 719, 751]