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.

A268705 Smallest n-digit prime having at least n-1 digits equal to 7.

Table of values

n a(n)
1 2
2 17
3 277
4 1777
5 47777
6 727777
7 7477777
8 77767777
9 577777777
10 1777777777
11 67777777777
12 377777777777
13 7177777777777
14 17777777777777
15 577777777777777
16 2777777777777777
17 77777767777777777
18 377777777777777777
19 2777777777777777777
20 71777777777777777777

List of values

[2, 17, 277, 1777, 47777, 727777, 7477777, 77767777, 577777777, 1777777777, 67777777777, 377777777777, 7177777777777, 17777777777777, 577777777777777, 2777777777777777, 77777767777777777, 377777777777777777, 2777777777777777777, 71777777777777777777]

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

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