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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.

A261310 a(n+1) = abs(a(n) - gcd(a(n), 10n+9)), a(1) = 1.

Table of values

n a(n)
1 1
2 0
3 29
4 28
5 21
6 20
7 19
8 18
9 17
10 16
11 15
12 14
13 13
14 12
15 11
16 10
17 9
18 8
19 7
20 6
21 5
22 4
23 3
24 2
25 1
26 0
27 269
28 268
29 267
30 266
31 265
32 264
33 263
34 262
35 261
36 260
37 259
38 258
39 257
40 256
41 255
42 254
43 253
44 252
45 251
46 250
47 249
48 248
49 247
50 246
51 245
52 244
53 243
54 242
55 241
56 240
57 239
58 238
59 237
60 236
61 235
62 234
63 233
64 232
65 231
66 230
67 229

List of values

[1, 0, 29, 28, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 269, 268, 267, 266, 265, 264, 263, 262, 261, 260, 259, 258, 257, 256, 255, 254, 253, 252, 251, 250, 249, 248, 247, 246, 245, 244, 243, 242, 241, 240, 239, 238, 237, 236, 235, 234, 233, 232, 231, 230, 229]

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

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