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.

A091920 Smallest n-digit prime with digits from {1,4,7} only, or 0 if no such prime exists.

Table of values

n a(n)
1 7
2 11
3 0
4 1117
5 11117
6 0
7 1111447
8 11111117
9 0
10 1111111411
11 11111111741
12 0
13 1111111111177
14 11111111111411
15 0
16 1111111111111447
17 11111111111111171
18 0
19 1111111111111111111
20 11111111111111111447
21 0
22 1111111111111111111711

List of values

[7, 11, 0, 1117, 11117, 0, 1111447, 11111117, 0, 1111111411, 11111111741, 0, 1111111111177, 11111111111411, 0, 1111111111111447, 11111111111111171, 0, 1111111111111111111, 11111111111111111447, 0, 1111111111111111111711]

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

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