Tính B = (2 + 1).(2^2 + 1)(2^4 + 1).(2^8 + 1)(2^16 + 1)

B = ( 2 + 1).( 2^2 + 1) . ( 2^4 + 1). ( 2^8 + 1) . ( 2^16 + 1)