C :

#include<stdio.h>
#include<stdbool.h>
bool heShu(int n){
	bool f = false;  //假设不是合数 
	int i;
	for(i = 2;i < n;i++){
		if(n % i == 0){
			f = true;
			break;
		}
	}
	if(n == 1){
		f = false;
	}
	return f;
}
int main(){
	int i;
	for(i = 100;i <= 999;i++){
		if(heShu(i) && heShu(i / 10) && heShu(i / 100)){
			printf("%d\n",i);
		}
	}
	return 0;
}

C++ :

#include<iostream>
#include<cmath>

using namespace std;


bool HeShu(int n);

int main(){
	int a=0,b=0,c=0;
	
	for(int i=100;i<=999;i++){
		a=i/100;
		b=i/10%10;
		c=i%10;
		
		if(HeShu(i)&&HeShu(a*10+b)&&HeShu(a)){
			cout<<i<<endl;
		}
	}
	
}

bool HeShu(int n){
	bool f;
	

	f=false;
	
	for(int i=2;i<=sqrt(n);i++){
		if(n%i==0){
			f=true;
			break;
		}
	}
	
	
	if(f==true && n>3){
		return true;
	}
	else
	{
		return false;
	}
	
}

Python :

import math
def suShu(n):
        f = True
        for i in range (2 , int(math.sqrt(n))+1):
                if n % i == 0:
                        f = False
                        break;
        return f;
def ccheShu(n):
        b = n // 100;
        c = n // 10;
        return not suShu(n) and  not suShu(b) and not suShu(c)

for i in range (100, 1000):
        if ccheShu(i):
                print(i)