cp's OEIS Frontend

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.

A242590 Numbers whose representation in Roman numerals is horizontally symmetrical.

Table of values

n a(n)
1 1
2 2
3 3
4 9
5 10
6 11
7 12
8 13
9 19
10 20
11 21
12 22
13 23
14 29
15 30
16 31
17 32
18 33
19 39
20 90
21 91
22 92
23 93
24 99
25 100
26 101
27 102
28 103
29 109
30 110
31 111
32 112
33 113
34 119
35 120
36 121
37 122
38 123
39 129
40 130
41 131
42 132
43 133
44 139
45 190
46 191
47 192
48 193
49 199
50 200
51 201
52 202
53 203
54 209
55 210
56 211
57 212
58 213
59 219
60 220
61 221
62 222
63 223
64 229
65 230
66 231
67 232
68 233
69 239
70 290

List of values

[1, 2, 3, 9, 10, 11, 12, 13, 19, 20, 21, 22, 23, 29, 30, 31, 32, 33, 39, 90, 91, 92, 93, 99, 100, 101, 102, 103, 109, 110, 111, 112, 113, 119, 120, 121, 122, 123, 129, 130, 131, 132, 133, 139, 190, 191, 192, 193, 199, 200, 201, 202, 203, 209, 210, 211, 212, 213, 219, 220, 221, 222, 223, 229, 230, 231, 232, 233, 239, 290]