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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.

A265402 Fixed points of A265388: numbers n for which gcd{k=1..n-1} binomial(2*n, 2*k) = n.

Table of values

n a(n)
1 11
2 17
3 23
4 29
5 43
6 47
7 53
8 59
9 67
10 71
11 73
12 83
13 89
14 101
15 103
16 107
17 109
18 113
19 127
20 131
21 137
22 149
23 151
24 163
25 167
26 173
27 179
28 191
29 193
30 197
31 223
32 227
33 233
34 239
35 241
36 251
37 257
38 263
39 269
40 277
41 281
42 283
43 293
44 311
45 317
46 347
47 349
48 353
49 359
50 373
51 383
52 389
53 397
54 401
55 409
56 419
57 431
58 433
59 443
60 449
61 457
62 461
63 463
64 467
65 479
66 487
67 491
68 503

List of values

[11, 17, 23, 29, 43, 47, 53, 59, 67, 71, 73, 83, 89, 101, 103, 107, 109, 113, 127, 131, 137, 149, 151, 163, 167, 173, 179, 191, 193, 197, 223, 227, 233, 239, 241, 251, 257, 263, 269, 277, 281, 283, 293, 311, 317, 347, 349, 353, 359, 373, 383, 389, 397, 401, 409, 419, 431, 433, 443, 449, 457, 461, 463, 467, 479, 487, 491, 503]