(1+2)(1+2²)(1+2^4).......(1+2^128)
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(1+2)(1+2²)(1+2^4).......(1+2^128)
=(2-1)(1+2)(1+2²)(1+2^4).......(1+2^128)
=(2^2-1)(1+2²)(1+2^4).......(1+2^128)
=(2^4-1)(1+2^4).......(1+2^128)
=(2^8-1)(1+2^8).......(1+2^128)
...
=(2^256)-1
=(2-1)(1+2)(1+2²)(1+2^4).......(1+2^128)
=(2^2-1)(1+2²)(1+2^4).......(1+2^128)
=(2^4-1)(1+2^4).......(1+2^128)
=(2^8-1)(1+2^8).......(1+2^128)
...
=(2^256)-1
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(1+2)(1+2²)(1+2^4).......(1+2^128)
=-(1-2)(1+2)(1+2²)(1+2^4).......(1+2^128)
=-(1-2²)(1+2²)(1+2^4).......(1+2^128)
=…………
=-(1-2^128)(1+2^128)
=-(1-2^256)
=2^256-1
=-(1-2)(1+2)(1+2²)(1+2^4).......(1+2^128)
=-(1-2²)(1+2²)(1+2^4).......(1+2^128)
=…………
=-(1-2^128)(1+2^128)
=-(1-2^256)
=2^256-1
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