#include #include #include using namespace std;bool isPrime(int num){ if (num & visited, string currentNum, unordered_set& check){ int count = 0; if(currentNum.size() > 0){ int num = stoi(currentNum); if(check.find(num) == check.end() && isPrime(num)){ check.insert(num); count++; } } for (int i = 0; i visited(numbers.size(), false); u..