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在前面乘个2-1
(2-1)(2+1)(2^2+1)(2^4+1).......(2^64+1)+1
=(2^2-1)(2^2+1)(2^4+1).......(2^64+1) +1
=(2^4-1)(2^4+1).......(2^64+1) +1
.......
=(2^64-1)(2^64+1) +1
=2^128-1+1
=2^128
(2-1)(2+1)(2^2+1)(2^4+1).......(2^64+1)+1
=(2^2-1)(2^2+1)(2^4+1).......(2^64+1) +1
=(2^4-1)(2^4+1).......(2^64+1) +1
.......
=(2^64-1)(2^64+1) +1
=2^128-1+1
=2^128
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