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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.

A043266 Sum of the digits of the n-th base 7 palindrome.

Table of values

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

List of values

[0, 1, 2, 3, 4, 5, 6, 2, 4, 6, 8, 10, 12, 2, 3, 4, 5, 6, 7, 8, 4, 5, 6, 7, 8, 9, 10, 6, 7, 8, 9, 10, 11, 12, 8, 9, 10, 11, 12, 13, 14, 10, 11, 12, 13, 14, 15, 16, 12, 13, 14, 15, 16, 17, 18, 2, 4, 6, 8, 10, 12, 14, 4, 6, 8, 10, 12, 14, 16, 6, 8, 10, 12, 14]

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