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.

A225531 Number of ordered pairs (i, j) with i, j >= 0, i + j <= n and gcd(i, j) <= 1.

Table of values

n a(n)
0 1
1 3
2 4
3 6
4 8
5 12
6 14
7 20
8 24
9 30
10 34
11 44
12 48
13 60
14 66
15 74
16 82
17 98
18 104
19 122
20 130
21 142
22 152
23 174
24 182
25 202
26 214
27 232
28 244
29 272
30 280
31 310
32 326
33 346
34 362
35 386
36 398
37 434
38 452
39 476
40 492
41 532
42 544
43 586
44 606
45 630
46 652
47 698
48 714
49 756
50 776

List of values

[1, 3, 4, 6, 8, 12, 14, 20, 24, 30, 34, 44, 48, 60, 66, 74, 82, 98, 104, 122, 130, 142, 152, 174, 182, 202, 214, 232, 244, 272, 280, 310, 326, 346, 362, 386, 398, 434, 452, 476, 492, 532, 544, 586, 606, 630, 652, 698, 714, 756, 776]