cp's OEIS Frontend

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.

A077186 Smallest multiple of prime(n) of the form 123...(k-1) k (k-1)...321 ( a concatenation of natural numbers from 1 to k and back to 1), or 0 if no such number exists.

Table of values

n a(n)
1 0
2 12321
3 0
4 12345654321
5 121
6 12345654321

List of values

[0, 12321, 0, 12345654321, 121, 12345654321]

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

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