This is a question out of curiosity. For example:
- $2$ is the ONLY even prime number.
- $5$ is the ONLY prime number whose last (or only) digit is $5$.
- $73$ is the ONLY prime number which satisfies both the product property and the mirror property (Shledon prime).
My question is, do you know other prime numbers that have unique properties?
The Prime Number 73939133 is also an interesting prime number. If you remove each digit from the right it is still a prime number every time. It is the largest number known to exhibit such property