:(2^2+1)(2^4+1)(2^8+1).(2^32+1)
=(2^2-1)(2^2+1)(2^4+1)(2^8+1).(2^32+1)/3
=(2^4-1)(2^4+1)(2^8+1).(2^32+1)/3
=.
=(2^64-1)/3