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.

A243703 Nonnegative numbers represented by the indefinite quadratic form -x^2+13xy+9y^2.

Table of values

n a(n)
1 0
2 9
3 21
4 31
5 36
6 39
7 41
8 45
9 49
10 51
11 61
12 81
13 84
14 91
15 105
16 119
17 124
18 141
19 144
20 155
21 156
22 159
23 164
24 169
25 180
26 189
27 195
28 196
29 201
30 204
31 205
32 221
33 225
34 244
35 245
36 251
37 255
38 279
39 289
40 291
41 305
42 324
43 329
44 336
45 349
46 351
47 364
48 369
49 371
50 379
51 389
52 401
53 405
54 411
55 419

List of values

[0, 9, 21, 31, 36, 39, 41, 45, 49, 51, 61, 81, 84, 91, 105, 119, 124, 141, 144, 155, 156, 159, 164, 169, 180, 189, 195, 196, 201, 204, 205, 221, 225, 244, 245, 251, 255, 279, 289, 291, 305, 324, 329, 336, 349, 351, 364, 369, 371, 379, 389, 401, 405, 411, 419]