Ta co (2n-1) la B(259)
B(259) : 0, 259, -259, 518, -518, 777, ...
2n-1=0 => n=1/22n-1=259 => n=1302n-1=-259 => n=-1292n-1=518=> n=519/22n-1=-518 => n=-517/22n-1=777=> n=389Cu nhu vay, ta nhan duoc cac gia tri cua n khac nhau nhung n la so tu nhien nho nhat nen n=130
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