Find the nth number in the increasing sequence formed by 0,2,4,6,8?

Question

We have an increasing sequence in which each element is consist of even digits only (0, 2, 4, 6, 8). How can we find the nth number in this sequence

Is

Answer 1

int Code()
{
    k=0;
   for(i=0;i<=10000;i++)
   {
       count=0;
       n=i;
       while(n!=0)
       {
           c=n%10;
           n=n/10;
           if(c%2!=0)
           {
               count=1;
           }
       }
       if(count==0)
       { a[k]=i;
       k++;}
    }
 }