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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.

A265529 Largest base-3 palindrome m <= n, written in base 10.

Table of values

n a(n)
0 0
1 1
2 2
3 2
4 4
5 4
6 4
7 4
8 8
9 8
10 10
11 10
12 10
13 13
14 13
15 13
16 16
17 16
18 16
19 16
20 20
21 20
22 20
23 23
24 23
25 23
26 26
27 26
28 28
29 28
30 28
31 28
32 28
33 28
34 28
35 28
36 28
37 28
38 28
39 28
40 40
41 40
42 40
43 40
44 40
45 40
46 40
47 40
48 40
49 40
50 40
51 40
52 52
53 52
54 52
55 52
56 56
57 56
58 56
59 56
60 56
61 56
62 56
63 56
64 56
65 56
66 56
67 56
68 68
69 68
70 68
71 68
72 68
73 68
74 68
75 68
76 68
77 68
78 68
79 68
80 80
81 80

List of values

[0, 1, 2, 2, 4, 4, 4, 4, 8, 8, 10, 10, 10, 13, 13, 13, 16, 16, 16, 16, 20, 20, 20, 23, 23, 23, 26, 26, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 52, 52, 52, 52, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 68, 68, 68, 68, 68, 68, 68, 68, 68, 68, 68, 68, 80, 80]

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