原式
=(2-1)(2+1)x(2^2+1)x(2^4+1)(2^8+1)+1
=(2^2-1)(2^2+1)x(2^4+1)(2^8+1)+1
=(2^4-1)x(2^4+1)(2^8+1)+1
=(2^8-1)(2^8+1)+1
=2^16-1+1
=2^16