(2+1)(2^2+1)(2^4+1).(2^64+1)+1
=(2^2-1)(2^2+1)(2^4+1).(2^64+1)+1
=(2^4-1)(2^4+1).(2^64+1)+1
=(2^8-1).(2^64+1)+1
=(2^128-1)+1
=2^128
2^4,2^8,2^16,2^32,2^64,2^128的末尾数为6
(2+1)(2^2+1)(2^4+1).(2^64+1)+1的末尾数为6
(2+1)(2^2+1)(2^4+1).(2^64+1)+1
=(2^2-1)(2^2+1)(2^4+1).(2^64+1)+1
=(2^4-1)(2^4+1).(2^64+1)+1
=(2^8-1).(2^64+1)+1
=(2^128-1)+1
=2^128
2^4,2^8,2^16,2^32,2^64,2^128的末尾数为6
(2+1)(2^2+1)(2^4+1).(2^64+1)+1的末尾数为6