(2+1)×(22+1)×(24+1)×(28+1)×(216+1)×(232+1)
=(2-1)(2+1)(2^2+1).(2^32+1)
=(2^2-1)(2^2+1).(2^32+1)
=(2^4-1).(2^32+1)
=.
=(2^32-1)(2^32+1)
=2^64-1
(2+1)×(22+1)×(24+1)×(28+1)×(216+1)×(232+1)
=(2-1)(2+1)(2^2+1).(2^32+1)
=(2^2-1)(2^2+1).(2^32+1)
=(2^4-1).(2^32+1)
=.
=(2^32-1)(2^32+1)
=2^64-1