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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.

A013642 Numbers k such that the continued fraction for sqrt(k) has period 2.

Table of values

n a(n)
1 3
2 6
3 8
4 11
5 12
6 15
7 18
8 20
9 24
10 27
11 30
12 35
13 38
14 39
15 40
16 42
17 48
18 51
19 56
20 63
21 66
22 68
23 72
24 80
25 83
26 84
27 87
28 90
29 99
30 102
31 104
32 105
33 110
34 120
35 123
36 132
37 143
38 146
39 147
40 148
41 150
42 152
43 156
44 168
45 171
46 182
47 195
48 198
49 200
50 203
51 210
52 224
53 227
54 228
55 230
56 231
57 235
58 240
59 255
60 258
61 260
62 264

List of values

[3, 6, 8, 11, 12, 15, 18, 20, 24, 27, 30, 35, 38, 39, 40, 42, 48, 51, 56, 63, 66, 68, 72, 80, 83, 84, 87, 90, 99, 102, 104, 105, 110, 120, 123, 132, 143, 146, 147, 148, 150, 152, 156, 168, 171, 182, 195, 198, 200, 203, 210, 224, 227, 228, 230, 231, 235, 240, 255, 258, 260, 264]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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