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.

A036229 Smallest n-digit prime containing only digits 1 or 2 or -1 if no such prime exists.

Table of values

n a(n)
1 2
2 11
3 211
4 2111
5 12211
6 111121
7 1111211
8 11221211
9 111112121
10 1111111121
11 11111121121
12 111111211111
13 1111111121221
14 11111111112221
15 111111112111121
16 1111111112122111
17 11111111111112121
18 111111111111112111
19 1111111111111111111
20 11111111111111212121

List of values

[2, 11, 211, 2111, 12211, 111121, 1111211, 11221211, 111112121, 1111111121, 11111121121, 111111211111, 1111111121221, 11111111112221, 111111112111121, 1111111112122111, 11111111111112121, 111111111111112111, 1111111111111111111, 11111111111111212121]

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

Content is available under The OEIS End-User License Agreement.