No Foolin’

The number 357,686,312,646,216,567,629,137 is a prime number. If you remove any number of digits from the left side, the resulting number is also prime. Numbers like this are called left-truncatable primes (they must not contain any zeros). There are exactly 4259 others ( BTW, 4259 is a prime). There are also  exactly 82 right-truncatable primes; the…