10^2 =100
11^2 =121
12^2 =144
13^2 =169
14^2 =196
15^2 =225
16^2 =256
17^2 =289
18^2 =324
19^2 =361
20^2 =400
21^2 =441
22^2 =484
23^2 =529
24^2 =576