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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.

A043269 a(n) is the sum of the digits of n-th base-10 palindrome.

Table of values

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

List of values

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 2, 4, 6, 8, 10, 12, 14, 16, 18, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 12, 13, 14, 15, 16, 17]

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