357686312646216567629137 is a very special prime number. Why is it so special, you ask? Because all of its suffixes are also prime numbers.
Isn’t that cool? 7, 37, 137, 9137, and so on are all prime numbers!
I call these sorts of prime numbers suffix primes. Their existence was pointed out to me by a friend in a Facebook comment. There are exactly 4260 suffix primes that do not contain zeros, and the above number is the largest. But what if we count the suffix primes that do contain zeros? How many are there? Are there perhaps infinitely many? What about prefix primes?