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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.

A207778 Smallest multiple of 2^n using only 1's and 2's.

Table of values

n a(n)
0 1
1 2
2 12
3 112
4 112
5 2112
6 2112
7 122112
8 122112
9 12122112
10 12122112
11 12122112
12 111212122112
13 1111212122112
14 11111212122112
15 11111212122112
16 11111212122112
17 11111212122112
18 111211111212122112
19 111211111212122112
20 111211111212122112
21 111211111212122112

List of values

[1, 2, 12, 112, 112, 2112, 2112, 122112, 122112, 12122112, 12122112, 12122112, 111212122112, 1111212122112, 11111212122112, 11111212122112, 11111212122112, 11111212122112, 111211111212122112, 111211111212122112, 111211111212122112, 111211111212122112]

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

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