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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.

A105311 a(n) = n concatenations of numbers from 1 to n, concatenated.

Table of values

n a(n)
1 1
2 1212
3 123123123
4 1234123412341234
5 1234512345123451234512345
6 123456123456123456123456123456123456
7 1234567123456712345671234567123456712345671234567
8 1234567812345678123456781234567812345678123456781234567812345678
9 123456789123456789123456789123456789123456789123456789123456789123456789123456789

List of values

[1, 1212, 123123123, 1234123412341234, 1234512345123451234512345, 123456123456123456123456123456123456, 1234567123456712345671234567123456712345671234567, 1234567812345678123456781234567812345678123456781234567812345678, 123456789123456789123456789123456789123456789123456789123456789123456789123456789]

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

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