Gasiti acele patrate perfecte care alaturate doua cate doua, formeaza alte patrate pefecte de cate 4 cifre.
16 81 = 41^2 4 225 = 65^2 4 900 = 70^2 (chiar si 49 00 = 70^2 ) ! 144 4 = 38^2 324 9 = 57^2
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