11, 13, 17, 19, 23, 25.....

import java.util.*;
class series
{
    public static void main(String args[])
    {
        int a=11;
        for(int i=1;i<=10;i++)
        {
           System.out.print(a+" ");
           a=a+2;
           System.out.print(a+" ");
           a=a+4;
           
        }
       
    }
}