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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.

A078998 Choose a(n) so that a(1)+a(2)+...+a(n) = concatenation of n first natural numbers.

Table of values

n a(n)
1 1
2 11
3 111
4 1111
5 11111
6 111111
7 1111111
8 11111111
9 111111111
10 12222222121
11 1222222212101
12 122222221210101
13 12222222121010101
14 1222222212101010101
15 122222221210101010101
16 12222222121010101010101

List of values

[1, 11, 111, 1111, 11111, 111111, 1111111, 11111111, 111111111, 12222222121, 1222222212101, 122222221210101, 12222222121010101, 1222222212101010101, 122222221210101010101, 12222222121010101010101]

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

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