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.

A355854 Numbers of the form (ab+cd)*(ad+bc) with integers a,b,c,d >= 1.

Table of values

n a(n)
1 4
2 9
3 16
4 20
5 25
6 35
7 36
8 49
9 54
10 56
11 60
12 64
13 77
14 80
15 81
16 91
17 99
18 100
19 104
20 108
21 110
22 121
23 128
24 135
25 136
26 140
27 143
28 144
29 154
30 156
31 169
32 170
33 171
34 176
35 180
36 182
37 187
38 189
39 195
40 196
41 209
42 216
43 220
44 221
45 224
46 225
47 240
48 250
49 252
50 256
51 260
52 266
53 270
54 272
55 275
56 286
57 289

List of values

[4, 9, 16, 20, 25, 35, 36, 49, 54, 56, 60, 64, 77, 80, 81, 91, 99, 100, 104, 108, 110, 121, 128, 135, 136, 140, 143, 144, 154, 156, 169, 170, 171, 176, 180, 182, 187, 189, 195, 196, 209, 216, 220, 221, 224, 225, 240, 250, 252, 256, 260, 266, 270, 272, 275, 286, 289]