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1,4,11,27,61133279 4=1*2+2 11=4*2+3 27=11*2+5 61=27*2+7 133=61*2+11 279=133*2+13 2,3,5,7,11,13是連續質數 規律如下: An+1=2An+f(n) f(n)是第n個質數.
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