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n²+(n+1)²+(n+2)² = n² + n² + 2n + 1 + n² + 4n + 4 =
= 3n² + 6n + 3 + 2 = 3(n²+2n+1) + 2
niech m = n²+2n+1
(3m+2)/3 = m r 2