Respuesta :

AL2006

There are only eight of them, because  9²  is more than  80 .

If I must, here they are:

1²  =  1
2²  =  4
3²  =  9
4²  =  16
5²  =  25
6²  =  36
7²  =  49
8²  =  64

You should be able to rattle off this list.