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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.

A235089 a(n)*Pi is the total length of irregular spiral (center points: 2, 1, 3, 4) after n rotations.

Table of values

n a(n)
1 3
2 10
3 13
4 20
5 23
6 30
7 33
8 40
9 43
10 50
11 53
12 60
13 63
14 70
15 73
16 80
17 83
18 90
19 93
20 100
21 103
22 110
23 113
24 120
25 123
26 130
27 133
28 140
29 143
30 150
31 153
32 160
33 163
34 170
35 173
36 180
37 183
38 190
39 193
40 200
41 203
42 210
43 213
44 220
45 223
46 230
47 233
48 240
49 243
50 250
51 253
52 260
53 263
54 270
55 273
56 280
57 283
58 290
59 293
60 300
61 303
62 310
63 313
64 320
65 323
66 330
67 333

List of values

[3, 10, 13, 20, 23, 30, 33, 40, 43, 50, 53, 60, 63, 70, 73, 80, 83, 90, 93, 100, 103, 110, 113, 120, 123, 130, 133, 140, 143, 150, 153, 160, 163, 170, 173, 180, 183, 190, 193, 200, 203, 210, 213, 220, 223, 230, 233, 240, 243, 250, 253, 260, 263, 270, 273, 280, 283, 290, 293, 300, 303, 310, 313, 320, 323, 330, 333]

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

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