4*(3²+1)(3^4+1).(3^16+1)-1
=(3+1)*)(3^4+1).(3^16+1)-1
=(3-1)(3+1)*)(3^4+1).(3^16+1)/2-1
=(3²-1)(3²+1)...(3^16+1)/2-1
=(3^32-1)/2-1
4*(3²+1)(3^4+1).(3^16+1)-1
=(3+1)*)(3^4+1).(3^16+1)-1
=(3-1)(3+1)*)(3^4+1).(3^16+1)/2-1
=(3²-1)(3²+1)...(3^16+1)/2-1
=(3^32-1)/2-1