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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.

A290508 Radius of largest circle among 4 circles each of which kisses the other three externally, and for which the radii are mutually coprime integers.

Table of values

n a(n)
1 12
2 15
3 24
4 63
5 69
6 70
7 72
8 80
9 105
10 120
11 120
12 132
13 153
14 168
15 198
16 216
17 231
18 234
19 238
20 252
21 264
22 264
23 270
24 275
25 280
26 285
27 290
28 315
29 336
30 390
31 392
32 420
33 429
34 504
35 504
36 520
37 539
38 544
39 567
40 585
41 595
42 624
43 627
44 658
45 658
46 672
47 672
48 690
49 693
50 693
51 696
52 714
53 715

List of values

[12, 15, 24, 63, 69, 70, 72, 80, 105, 120, 120, 132, 153, 168, 198, 216, 231, 234, 238, 252, 264, 264, 270, 275, 280, 285, 290, 315, 336, 390, 392, 420, 429, 504, 504, 520, 539, 544, 567, 585, 595, 624, 627, 658, 658, 672, 672, 690, 693, 693, 696, 714, 715]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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