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一個數乘3再减去它前面的數=這個數後面的數 1、3、8、21、55、144、377 後一個數乘以3减前一個數等於下一個數 3*3-1=8 8*3-3=21 21*3-8=55 55*3-21=()=144 144*3-55=()=377 ()裏兩個數分別為144377
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