SCOTT@orcl_12.1.0.2.0> DECLARE
  2    TYPE my_varray IS VARRAY(31) OF NUMBER;
  3    var	 my_varray := my_varray();
  4    my_value  NUMBER := 0;
  5  BEGIN
  6    var.extend(31);
  7    FOR counter IN 1 .. 31 LOOP
  8  	 my_value := my_value + 2;
  9  	 var(counter) := my_value;
 10    END LOOP;
 11    FOR counter IN 1 ..31 LOOP
 12  	 DBMS_OUTPUT.PUT_LINE (counter || '   ' || var(counter));
 13    END LOOP;
 14  END;
 15  /
1   2
2   4
3   6
4   8
5   10
6   12
7   14
8   16
9   18
10   20
11   22
12   24
13   26
14   28
15   30
16   32
17   34
18   36
19   38
20   40
21   42
22   44
23   46
24   48
25   50
26   52
27   54
28   56
29   58
30   60
31   62

PL/SQL procedure successfully completed.