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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.

A261544 a(n) = Sum_{k=0..n} 1000^k.

Table of values

n a(n)
0 1
1 1001
2 1001001
3 1001001001
4 1001001001001
5 1001001001001001
6 1001001001001001001
7 1001001001001001001001
8 1001001001001001001001001
9 1001001001001001001001001001
10 1001001001001001001001001001001
11 1001001001001001001001001001001001

List of values

[1, 1001, 1001001, 1001001001, 1001001001001, 1001001001001001, 1001001001001001001, 1001001001001001001001, 1001001001001001001001001, 1001001001001001001001001001, 1001001001001001001001001001001, 1001001001001001001001001001001001]

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