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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.

A291691 Primes p such that gpf(lpf(2^p - 1) - 1) = p.

Table of values

n a(n)
1 2
2 3
3 5
4 7
5 11
6 13
7 23
8 29
9 37
10 43
11 47
12 53
13 73
14 79
15 83
16 97
17 113
18 131
19 151
20 173
21 179
22 181
23 191
24 197
25 211
26 223
27 233
28 239
29 251
30 263
31 277
32 281
33 283
34 307
35 317
36 337
37 353
38 359
39 367
40 383
41 397
42 419
43 431
44 439
45 443
46 457
47 461
48 463
49 467
50 487
51 491
52 499

List of values

[2, 3, 5, 7, 11, 13, 23, 29, 37, 43, 47, 53, 73, 79, 83, 97, 113, 131, 151, 173, 179, 181, 191, 197, 211, 223, 233, 239, 251, 263, 277, 281, 283, 307, 317, 337, 353, 359, 367, 383, 397, 419, 431, 439, 443, 457, 461, 463, 467, 487, 491, 499]