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.

A340487 a(n) is the least prime that is the concatenation of two n-digit primes, or 0 if there are none.

Table of values

n a(n)
1 23
2 1117
3 101107
4 10091021
5 1000710181
6 100003100129
7 10000031000171
8 1000001910000349
9 100000007100000541
10 10000000071000000349
11 1000000001910000000319
12 100000000003100000000063
13 10000000000391000000000903
14 1000000000003710000000000259
15 100000000000031100000000000403

List of values

[23, 1117, 101107, 10091021, 1000710181, 100003100129, 10000031000171, 1000001910000349, 100000007100000541, 10000000071000000349, 1000000001910000000319, 100000000003100000000063, 10000000000391000000000903, 1000000000003710000000000259, 100000000000031100000000000403]