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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.

A173804 a(n) = (5*10^n - 41)/9 for n > 0.

Table of values

n a(n)
1 1
2 51
3 551
4 5551
5 55551
6 555551
7 5555551
8 55555551
9 555555551
10 5555555551
11 55555555551
12 555555555551
13 5555555555551
14 55555555555551
15 555555555555551
16 5555555555555551
17 55555555555555551
18 555555555555555551
19 5555555555555555551
20 55555555555555555551
21 555555555555555555551

List of values

[1, 51, 551, 5551, 55551, 555551, 5555551, 55555551, 555555551, 5555555551, 55555555551, 555555555551, 5555555555551, 55555555555551, 555555555555551, 5555555555555551, 55555555555555551, 555555555555555551, 5555555555555555551, 55555555555555555551, 555555555555555555551]

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

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