=(2-1)(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)
=(2²-1)(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 2²=4 2³=8 2^4的末尾是6,2^5结尾是2,2^6末尾是4,循环到2^32末尾得6,6-1=5,故选D
=(2-1)(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)
=(2²-1)(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 2²=4 2³=8 2^4的末尾是6,2^5结尾是2,2^6末尾是4,循环到2^32末尾得6,6-1=5,故选D