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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.

A081502 Let n = 10x + y where 0 <= y <= 9, x >= 0. Then a(n) = 3x+y.

Table of values

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

List of values

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 21, 22, 23, 24, 25, 26, 27, 28, 29]

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