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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.

A350508 Numbers whose base-10 representation is a (scattered) subsequence of their base-3 representation.

Table of values

n a(n)
1 0
2 1
3 2
4 10
5 20
6 21
7 100
8 102
9 110
10 111
11 210
12 211
13 212
14 220
15 221
16 222
17 1000
18 1010
19 1011
20 1020
21 1021
22 1022
23 1110
24 1111
25 1112
26 1121
27 1122
28 2000
29 2001
30 2010
31 2011
32 2012
33 2021
34 2022
35 12101
36 12102
37 12111
38 12112
39 12120
40 12121
41 12122
42 12201
43 12202
44 12221
45 12222
46 20220

List of values

[0, 1, 2, 10, 20, 21, 100, 102, 110, 111, 210, 211, 212, 220, 221, 222, 1000, 1010, 1011, 1020, 1021, 1022, 1110, 1111, 1112, 1121, 1122, 2000, 2001, 2010, 2011, 2012, 2021, 2022, 12101, 12102, 12111, 12112, 12120, 12121, 12122, 12201, 12202, 12221, 12222, 20220]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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