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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.

A098129 Concatenate 1 once, 2 twice, 3 three times, up to n n times.

Table of values

n a(n)
1 1
2 122
3 122333
4 1223334444
5 122333444455555
6 122333444455555666666
7 1223334444555556666667777777
8 122333444455555666666777777788888888
9 122333444455555666666777777788888888999999999

List of values

[1, 122, 122333, 1223334444, 122333444455555, 122333444455555666666, 1223334444555556666667777777, 122333444455555666666777777788888888, 122333444455555666666777777788888888999999999]

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

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