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.

A099071 Composite numbers k such that the concatenation of all nonprime positive integers up to k in decreasing order is prime.

Table of values

n a(n)
1 4
2 6
3 8
4 9
5 26
6 1752

List of values

[4, 6, 8, 9, 26, 1752]