Τετράγωνα καθρέπτης

$10^2 = 100$ < - - - > $001 = 01^2$

$11^2 = 121$ < - - - > $121 = 11^2$

$12^2 = 144$ < - - - > $441 = 21^2$

$13^2 = 169$ < - - - > $961 = 31^2$