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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.

A261307 a(n+1) = abs(a(n) - gcd(a(n), 7*n+6)), a(1) = 1.

Table of values

n a(n)
1 1
2 0
3 20
4 19
5 18
6 17
7 16
8 15
9 14
10 13
11 12
12 11
13 10
14 9
15 8
16 7
17 6
18 5
19 4
20 3
21 2
22 1
23 0
24 167
25 166
26 165
27 164
28 163
29 162
30 161
31 160
32 159
33 158
34 79
35 78
36 77
37 76
38 75
39 74
40 73
41 72
42 71
43 70
44 69
45 68
46 67
47 66
48 65
49 64
50 63
51 62
52 61
53 60
54 59
55 58
56 57
57 56
58 55
59 54
60 53
61 52
62 51
63 50
64 49
65 48
66 47
67 46
68 45
69 44
70 43
71 42
72 41
73 40
74 39
75 38
76 37
77 36
78 35

List of values

[1, 0, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 167, 166, 165, 164, 163, 162, 161, 160, 159, 158, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35]

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