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.

A341720 a(n) = smallest k > 0 such that the decimal concatenation n||n+1||n+2||...||n+k is prime, or -1 if no such prime exists.

Table of values

n a(n)
2 1
3 16
4 3
5 12
6 1
7 6
8 1
9 178

List of values

[1, 16, 3, 12, 1, 6, 1, 178]