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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.

A031404 Numbers k such that the continued fraction for sqrt(k) has even period 2*m and the m-th term of the periodic part is 1.

Table of values

n a(n)
1 3
2 7
3 8
4 15
5 24
6 32
7 35
8 48
9 63
10 75
11 80
12 88
13 91
14 99
15 115
16 120
17 135
18 136
19 143
20 168
21 175
22 176
23 195
24 208
25 215
26 224
27 247
28 255
29 279
30 280
31 288
32 304
33 312
34 319
35 323
36 360
37 399
38 403
39 427
40 432
41 440
42 464
43 483
44 528
45 539
46 551
47 555
48 560
49 575
50 595
51 611
52 624
53 671
54 675
55 696

List of values

[3, 7, 8, 15, 24, 32, 35, 48, 63, 75, 80, 88, 91, 99, 115, 120, 135, 136, 143, 168, 175, 176, 195, 208, 215, 224, 247, 255, 279, 280, 288, 304, 312, 319, 323, 360, 399, 403, 427, 432, 440, 464, 483, 528, 539, 551, 555, 560, 575, 595, 611, 624, 671, 675, 696]

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

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