Calculation: 8 (3 ^ 2 + 1) (3 ^ 4 + 1) (3 ^ 8 + 1) (3 ^ 16 + 1) + 1 =? What method?

Calculation: 8 (3 ^ 2 + 1) (3 ^ 4 + 1) (3 ^ 8 + 1) (3 ^ 16 + 1) + 1 =? What method?

Square difference formula
Original formula = (3 ^ 2-1) (3 ^ 2 + 1) (3 ^ 4 + 1) (3 ^ 8 + 1) (3 ^ 16 + 1) + 1
=(3^4-1)(3^4+1)(3^8+1)(3^16+1)+1
=(3^8-1)(3^8+1)(3^16+1)+1
=(3^16-1)(3^16+1)+1
=3^32-1+1
=3^32