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.

A031363 Positive numbers of the form x^2 + xy - y^2; or, of the form 5x^2 - y^2.

Table of values

n a(n)
1 1
2 4
3 5
4 9
5 11
6 16
7 19
8 20
9 25
10 29
11 31
12 36
13 41
14 44
15 45
16 49
17 55
18 59
19 61
20 64
21 71
22 76
23 79
24 80
25 81
26 89
27 95
28 99
29 100
30 101
31 109
32 116
33 121
34 124
35 125
36 131
37 139
38 144
39 145
40 149
41 151
42 155
43 164
44 169
45 171
46 176
47 179
48 180
49 181
50 191
51 196
52 199
53 205
54 209
55 211
56 220
57 225
58 229
59 236

List of values

[1, 4, 5, 9, 11, 16, 19, 20, 25, 29, 31, 36, 41, 44, 45, 49, 55, 59, 61, 64, 71, 76, 79, 80, 81, 89, 95, 99, 100, 101, 109, 116, 121, 124, 125, 131, 139, 144, 145, 149, 151, 155, 164, 169, 171, 176, 179, 180, 181, 191, 196, 199, 205, 209, 211, 220, 225, 229, 236]