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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.

A083909 Numbers of the form 10^(m-k)*(10^(m+k+1)-10^k), m, k >= 0.

Table of values

n a(n)
1 9
2 990
3 99900
4 9999000
5 999990000
6 99999900000
7 9999999000000
8 999999990000000
9 99999999900000000
10 9999999999000000000
11 999999999990000000000
12 99999999999900000000000
13 9999999999999000000000000
14 999999999999990000000000000
15 99999999999999900000000000000

List of values

[9, 990, 99900, 9999000, 999990000, 99999900000, 9999999000000, 999999990000000, 99999999900000000, 9999999999000000000, 999999999990000000000, 99999999999900000000000, 9999999999999000000000000, 999999999999990000000000000, 99999999999999900000000000000]

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

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