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.

A249572 Least positive integer whose decimal digits divide the plane into n+1 regions. Equivalently, least positive integer with n holes in its decimal digits.

Table of values

n a(n)
0 1
1 4
2 8
3 48
4 88
5 488
6 888
7 4888
8 8888
9 48888
10 88888
11 488888
12 888888
13 4888888
14 8888888
15 48888888
16 88888888
17 488888888
18 888888888
19 4888888888
20 8888888888
21 48888888888
22 88888888888
23 488888888888
24 888888888888
25 4888888888888
26 8888888888888
27 48888888888888

List of values

[1, 4, 8, 48, 88, 488, 888, 4888, 8888, 48888, 88888, 488888, 888888, 4888888, 8888888, 48888888, 88888888, 488888888, 888888888, 4888888888, 8888888888, 48888888888, 88888888888, 488888888888, 888888888888, 4888888888888, 8888888888888, 48888888888888]

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

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