cp's OEIS Frontend

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.

A243705 Nonnegative numbers represented by the indefinite quadratic form 3x^2+13xy-3y^2.

Table of values

n a(n)
1 0
2 3
3 7
4 12
5 13
6 15
7 17
8 27
9 28
10 35
11 47
12 48
13 52
14 53
15 60
16 63
17 65
18 67
19 68
20 75
21 85
22 93
23 97
24 108
25 112
26 117
27 123
28 135
29 137
30 140
31 147
32 153
33 157
34 167
35 175
36 177
37 183
38 188
39 192
40 193
41 208
42 212
43 217
44 227
45 233
46 235
47 240
48 243
49 252
50 257
51 260
52 263
53 265
54 268

List of values

[0, 3, 7, 12, 13, 15, 17, 27, 28, 35, 47, 48, 52, 53, 60, 63, 65, 67, 68, 75, 85, 93, 97, 108, 112, 117, 123, 135, 137, 140, 147, 153, 157, 167, 175, 177, 183, 188, 192, 193, 208, 212, 217, 227, 233, 235, 240, 243, 252, 257, 260, 263, 265, 268]