(3+1)(3^2+1)(3^4+1)(3^8+1)-3^16
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(3+1)(3^2+1)(3^4+1)(3^8+1)-3^16
=(3-1)(3+1)(3^2+1)(3^4+1)(3^8+1)/2-3^16
=(3^2-1)(3^2+1)(3^4+1)(3^8+1)/2-3^16
=(3^4-1)(3^4+1)(3^8+1)/2-3^16
=(3^8-1)(3^8+1)/2-3^16
=(3^16-1)/2-3^16
=3^16/2-1/2-3^16
=-1/2-1/2*3^16
=(3-1)(3+1)(3^2+1)(3^4+1)(3^8+1)/2-3^16
=(3^2-1)(3^2+1)(3^4+1)(3^8+1)/2-3^16
=(3^4-1)(3^4+1)(3^8+1)/2-3^16
=(3^8-1)(3^8+1)/2-3^16
=(3^16-1)/2-3^16
=3^16/2-1/2-3^16
=-1/2-1/2*3^16
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