#include using namespace std; bool isPrime(int number) { for (int i = 2; i * i <= number; i++) if (number % i == 0) return false; return true; } int main() { int n;//输入的数 cin >> n; //计算从4开始到这个指定数字结束 for (int i = 4; i <= n; i += 2) { for (int j = 2; j < i; j++) { if (isPrime(j) && isPrime(i - j)) { cout << i << "=" << j << "+" << i - j << endl; break; } } } }