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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.

A020347 Numbers k such that the continued fraction for sqrt(k) has period 6.

Table of values

n a(n)
1 19
2 21
3 22
4 45
5 52
6 54
7 57
8 59
9 70
10 77
11 88
12 107
13 111
14 112
15 114
16 117
17 131
18 164
19 165
20 175
21 178
22 183
23 187
24 208
25 216
26 221
27 232
28 267
29 270
30 273
31 275
32 278
33 280
34 285
35 294
36 296
37 303
38 308
39 350
40 357
41 371
42 372
43 374
44 381
45 387
46 407
47 418
48 437
49 456
50 470
51 498
52 499
53 507
54 510
55 514
56 518

List of values

[19, 21, 22, 45, 52, 54, 57, 59, 70, 77, 88, 107, 111, 112, 114, 117, 131, 164, 165, 175, 178, 183, 187, 208, 216, 221, 232, 267, 270, 273, 275, 278, 280, 285, 294, 296, 303, 308, 350, 357, 371, 372, 374, 381, 387, 407, 418, 437, 456, 470, 498, 499, 507, 510, 514, 518]