(m8)^2, r=0
(m8+1)^2, r=1
(m8+2)^2, r=4
(m8+3)^2, r=1
(m8+4)^2, r=0
(m8+5)^2, r=1
(m8+6)^2, r=4
(m8+7)^2, r=1
r={0,1,4}
n-am detaliat dar poti verifica singura ridicand la patrat si impartind la 8
concluzie: orice patrat perfect are una din formele; m*8, m*8+1, m*8+4
