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