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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.

A135475 Sorted list of strings that can be obtained by starting with 123 and repeatedly doubling any substring in place.

Table of values

n a(n)
1 123
2 1123
3 1223
4 1233
5 11123
6 11223
7 11233
8 12123
9 12223
10 12233
11 12323
12 12333
13 111123
14 111223
15 111233
16 112123
17 112223
18 112233
19 112323
20 112333
21 121123
22 121223
23 121233
24 122123
25 122223
26 122233
27 122323
28 122333
29 123123
30 123223
31 123233
32 123323
33 123333
34 1111123

List of values

[123, 1123, 1223, 1233, 11123, 11223, 11233, 12123, 12223, 12233, 12323, 12333, 111123, 111223, 111233, 112123, 112223, 112233, 112323, 112333, 121123, 121223, 121233, 122123, 122223, 122233, 122323, 122333, 123123, 123223, 123233, 123323, 123333, 1111123]

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

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