#include
#define left 0
#define right 40
int prime(int x){
int d = 2;
while(d < x && x%d != 0) d++;
return d == x;
}
int main(){
int x;
for(x = left; x <= right; x++)<br> if( !prime(x*x + x + 41) ){
printf("False \n%d^2 + %d + 41 = %d \n", x, x, x*x + x + 41);
break;
}
if(x > right) printf("True \n");
return 0;
}