(3+1)(3^2+1)(3^3+1)(3^4+1)(3^5+1)……(3^32+1)
=1/2×(3-1)(3+1)(3^2+1)(3^3+1)(3^4+1)(3^5+1)……(3^32+1)
=1/2×(3^2-1)(3^2+1)(3^3+1)(3^4+1)(3^5+1)……(3^32+1)
……
=1/2×(3^64-1)
=(3^64-1)/2
(3+1)(3^2+1)(3^3+1)(3^4+1)(3^5+1)……(3^32+1)
=1/2×(3-1)(3+1)(3^2+1)(3^3+1)(3^4+1)(3^5+1)……(3^32+1)
=1/2×(3^2-1)(3^2+1)(3^3+1)(3^4+1)(3^5+1)……(3^32+1)
……
=1/2×(3^64-1)
=(3^64-1)/2