Highlander Primes
A prime is a prime number of length such that, if you remove its last digits , you will still end up with a prime number but if you remove its first digit, you will end up with a composite number (e.g. 239 is a highlander prime because it is prime as well as 2 and 23 but 39 is composite.)
What is the biggest 4-digits highlander prime ?
The answer is 7393.
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