Pandigital prime

 Published on Friday, 11th April 2003, 06:00 pm; Solved by 68495;
Difficulty rating: 5%

Problem 41

We shall say that an n-digit number is pandigital if it makes use of all the digits 1 to n exactly once. For example, 2143 is a 4-digit pandigital and is also prime.

What is the largest n-digit pandigital prime that exists?