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