0,1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400,441,484,529,576,625.... (adică 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25 la a doua.
patra perfect=inmultesti acel numar cu el sau la puterea a 2 de exemplu: 1=1^2=1 2=2^2=4 3=3^2=9 4=4^2=16 5=5^2=25 6=6^2=36 7=7^2=49 8=8^2=64 9=9^2=81 10=10^2=100
