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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.

A332154 a(n) = 5*(10^(2*n+1)-1)/9 - 10^n.

Table of values

n a(n)
0 4
1 545
2 55455
3 5554555
4 555545555
5 55555455555
6 5555554555555
7 555555545555555
8 55555555455555555
9 5555555554555555555
10 555555555545555555555
11 55555555555455555555555
12 5555555555554555555555555
13 555555555555545555555555555
14 55555555555555455555555555555
15 5555555555555554555555555555555

List of values

[4, 545, 55455, 5554555, 555545555, 55555455555, 5555554555555, 555555545555555, 55555555455555555, 5555555554555555555, 555555555545555555555, 55555555555455555555555, 5555555555554555555555555, 555555555555545555555555555, 55555555555555455555555555555, 5555555555555554555555555555555]

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

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