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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.

A081595 Let n = 10x + y where 0 <= y <= 9, x >= 0. Then a(n) = 4x+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 4
11 5
12 6
13 7
14 8
15 9
16 10
17 11
18 12
19 13
20 8
21 9
22 10
23 11
24 12
25 13
26 14
27 15
28 16
29 17
30 12
31 13
32 14
33 15
34 16
35 17
36 18
37 19
38 20
39 21
40 16
41 17
42 18
43 19
44 20
45 21
46 22
47 23
48 24
49 25
50 20
51 21
52 22
53 23
54 24
55 25
56 26
57 27
58 28
59 29
60 24
61 25
62 26
63 27
64 28
65 29
66 30
67 31
68 32
69 33
70 28
71 29
72 30
73 31
74 32
75 33
76 34
77 35

List of values

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 28, 29, 30, 31, 32, 33, 34, 35]

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