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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.

A290931 Radius of a circle enclosing three mutually tangent circles, such that they have coprime integer radii and with collectively six distinct points of tangency.

Table of values

n a(n)
1 6
2 6
3 15
4 18
5 20
6 21
7 28
8 35
9 40
10 40
11 42
12 42
13 45
14 45
15 52
16 54
17 56
18 63
19 66
20 66
21 72
22 75
23 77
24 88
25 91
26 95
27 99
28 100
29 104
30 105
31 105
32 110
33 112
34 117
35 120
36 126
37 130
38 143
39 153
40 153
41 156
42 160
43 160
44 165
45 165
46 168
47 170
48 175
49 186
50 187
51 189
52 190
53 195
54 196
55 198
56 198
57 204
58 208
59 208

List of values

[6, 6, 15, 18, 20, 21, 28, 35, 40, 40, 42, 42, 45, 45, 52, 54, 56, 63, 66, 66, 72, 75, 77, 88, 91, 95, 99, 100, 104, 105, 105, 110, 112, 117, 120, 126, 130, 143, 153, 153, 156, 160, 160, 165, 165, 168, 170, 175, 186, 187, 189, 190, 195, 196, 198, 198, 204, 208, 208]

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

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