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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.

A165301 a(n) is the smallest number not already in the sequence, such that the concatenation of all a(n) displays the periodic digit string 1, 2, 3 (and repeat).

Table of values

n a(n)
1 1
2 2
3 3
4 12
5 31
6 23
7 123
8 1231
9 231
10 2312
11 312
12 3123
13 12312
14 31231
15 23123
16 123123
17 1231231
18 231231
19 2312312
20 312312
21 3123123
22 12312312
23 31231231
24 23123123
25 123123123
26 1231231231
27 231231231
28 2312312312
29 312312312
30 3123123123
31 12312312312
32 31231231231

List of values

[1, 2, 3, 12, 31, 23, 123, 1231, 231, 2312, 312, 3123, 12312, 31231, 23123, 123123, 1231231, 231231, 2312312, 312312, 3123123, 12312312, 31231231, 23123123, 123123123, 1231231231, 231231231, 2312312312, 312312312, 3123123123, 12312312312, 31231231231]

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

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