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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.

A332124 a(n) = 2*(10^(2n+1)-1)/9 + 2*10^n.

Table of values

n a(n)
0 4
1 242
2 22422
3 2224222
4 222242222
5 22222422222
6 2222224222222
7 222222242222222
8 22222222422222222
9 2222222224222222222
10 222222222242222222222
11 22222222222422222222222
12 2222222222224222222222222
13 222222222222242222222222222
14 22222222222222422222222222222
15 2222222222222224222222222222222

List of values

[4, 242, 22422, 2224222, 222242222, 22222422222, 2222224222222, 222222242222222, 22222222422222222, 2222222224222222222, 222222222242222222222, 22222222222422222222222, 2222222222224222222222222, 222222222222242222222222222, 22222222222222422222222222222, 2222222222222224222222222222222]

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

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