(1+2)(1+2^2)(1+2^4)(1+2^8)(1+2^16)
=(2-1)(1+2)(1+2^2)(1+2^4)(1+2^8)(1+2^16)
=(2^2-1)(1+2^2)(1+2^4)(1+2^8)(1+2^16)
=(2^2-1)(1+2^2)(1+2^4)(1+2^8)(1+2^16)
=(2^4-1)(1+2^4)(1+2^8)(1+2^16)
=(2^8-1)(1+2^8)(1+2^16)
=(2^16-1)(1+2^16)
=2^32-1
(1+2)(1+2^2)(1+2^4)(1+2^8)(1+2^16)
=(2-1)(1+2)(1+2^2)(1+2^4)(1+2^8)(1+2^16)
=(2^2-1)(1+2^2)(1+2^4)(1+2^8)(1+2^16)
=(2^2-1)(1+2^2)(1+2^4)(1+2^8)(1+2^16)
=(2^4-1)(1+2^4)(1+2^8)(1+2^16)
=(2^8-1)(1+2^8)(1+2^16)
=(2^16-1)(1+2^16)
=2^32-1