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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.

A212193 In ternary representation of n: a(n) = if n is pandigital then 3 else least digit not used.

Table of values

n a(n)
0 1
1 0
2 0
3 2
4 0
5 0
6 1
7 0
8 0
9 2
10 2
11 3
12 2
13 0
14 0
15 3
16 0
17 0
18 1
19 3
20 1
21 3
22 0
23 0
24 1
25 0
26 0
27 2
28 2
29 3
30 2
31 2
32 3
33 3
34 3
35 3
36 2
37 2
38 3
39 2
40 0
41 0
42 3
43 0
44 0
45 3
46 3
47 3
48 3
49 0
50 0
51 3
52 0
53 0
54 1
55 3
56 1
57 3
58 3
59 3
60 1
61 3
62 1
63 3
64 3
65 3
66 3
67 0
68 0
69 3
70 0
71 0
72 1
73 3
74 1
75 3
76 0
77 0
78 1
79 0
80 0
81 2
82 2
83 3
84 2
85 2

List of values

[1, 0, 0, 2, 0, 0, 1, 0, 0, 2, 2, 3, 2, 0, 0, 3, 0, 0, 1, 3, 1, 3, 0, 0, 1, 0, 0, 2, 2, 3, 2, 2, 3, 3, 3, 3, 2, 2, 3, 2, 0, 0, 3, 0, 0, 3, 3, 3, 3, 0, 0, 3, 0, 0, 1, 3, 1, 3, 3, 3, 1, 3, 1, 3, 3, 3, 3, 0, 0, 3, 0, 0, 1, 3, 1, 3, 0, 0, 1, 0, 0, 2, 2, 3, 2, 2]

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