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.

A338754 Duplicate each decimal digit of n, so 0 -> 00, ..., 9 -> 99.

Table of values

n a(n)
0 0
1 11
2 22
3 33
4 44
5 55
6 66
7 77
8 88
9 99
10 1100
11 1111
12 1122
13 1133
14 1144
15 1155
16 1166
17 1177
18 1188
19 1199
20 2200
21 2211
22 2222
23 2233
24 2244
25 2255
26 2266
27 2277
28 2288
29 2299
30 3300
31 3311
32 3322
33 3333
34 3344
35 3355
36 3366
37 3377
38 3388
39 3399
40 4400
41 4411
42 4422
43 4433
44 4444
45 4455
46 4466

List of values

[0, 11, 22, 33, 44, 55, 66, 77, 88, 99, 1100, 1111, 1122, 1133, 1144, 1155, 1166, 1177, 1188, 1199, 2200, 2211, 2222, 2233, 2244, 2255, 2266, 2277, 2288, 2299, 3300, 3311, 3322, 3333, 3344, 3355, 3366, 3377, 3388, 3399, 4400, 4411, 4422, 4433, 4444, 4455, 4466]