program to display lucky number in java

import java.io.*;
class lucky
    {
        public static void meth()throws IOException
        {
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
   
    System.out.println("enter limit");
    int n=Integer.parseInt(br.readLine());
   int ar[]=new int[n];
   for(int i=0;i<n;i++)
    ar[i]=i+1;
      
       int a,b,c,d;
        a=1;
      
        b=ar.length;
        int gap=2;
        while(true)
        {
        for(c=a;c<b;c=c+gap)
            {
                ar[c]=-1;
            }
        d=0;
        for(c=0;c<b;c++)
            {
                if(ar[c] != -1)
                    d++;
            }
        int temp[]=new int[d];
        int p=0;
        for(c=0;c<b;c++)
            {
                if(ar[c] != -1)
                    temp[p++]=ar[c];
                ar[c]=-1;
            }
         for(c=0;c<p;c++)
            {
                ar[c]=temp[c];
            }
         a=a+1;
         gap++;
         if(a>d)
            {
                break;
            }
        }
      int res=0;
      for(int i=0;i<8;i++)
        {
            if(ar[i] != -1)
                {
                    int digi=ar[i];
                    c=0;
                    while(digi>0)
                        {
                            c++;
                            digi/=10;
                        }
                    double t=Math.pow(10,c);
                    res=(res*(int)t)+ar[i];
                }
            }
         System.out.println(res);
       }
    }