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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.

A169805 Twice the sum of the digits of n.

Table of values

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

List of values

[0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 14, 16, 18, 20, 22, 24, 26]

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