Why i get wrong answer with this code in which case does it fail???
#include <iostream>
using namespace std;
int main()
{
int TC;
scanf("%d",&TC);
while(TC--)
{
int a,b;
scanf("%d %d",&a,&b);
while(a<(b+1))
{
if (a==1){a++;}
if (a==(b+1)){break;}
if (a==2||a==3||a==5||a==7) {printf("%d\n",a);}
if (a%2==0 ||a%3==0 ||a%4==0 ||a%5==0 ||a%6==0 ||a%7==0 ||a%8==0 ||a%9==0){}
else {printf("%d\n",a);}
a++;
}
printf("\n");
}
return 0;
}