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Old 2021-07-17, 07:20   #2
Alberico Lepore
 
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May 2017
ITALY

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ERRATA CORRIGE

[2*(x-1)*((x-1)+1)] < [2*x*(x+1)-y*(y-1)/2] <= [2*(x)*(x+1)]

1 <= y < (sqrt(32*x+1)+1)/2
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