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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.

A357314 a(1) = 1; a(n) is the second smallest number k such that k > a(n-1) and concatenation of a(1), ..., a(n-1), k is a palindrome.

Table of values

n a(n)
1 1
2 21
3 1121
4 1211121
5 2111211211121
6 112112111212111211211121
7 12111212111211211121112112111212111211211121
8 211121121112111211211121211121121112112111212111211211121112112111212111211211121

List of values

[1, 21, 1121, 1211121, 2111211211121, 112112111212111211211121, 12111212111211211121112112111212111211211121, 211121121112111211211121211121121112112111212111211211121112112111212111211211121]

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

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