declare
   type t_array is table of varchar2(1) index by binary_integer;
   type t_lookup is varray(5) of number;
   v_array t_array;
   v_lookup t_lookup := t_lookup(1,3,5);
begin
  v_array(1) := 'x';
  v_array(2) := 'x';
  v_array(3) := 'x';
  v_array(8) := 'x';
  v_array(10) := 'x';
  for i in v_lookup.first..v_lookup.last loop
     if v_array.exists(v_lookup(i)) then
        dbms_output.put_line('Found '||v_lookup(i));
     else
        dbms_Output.put_line('Did not find '||v_lookup(i));
     end if;
  end loop;
end;