前面乘个(2-1)(2^2-1)/(2-1)(2^2-1)
原式子化成(2-1)(2^2-1)(2^2+1)(2^4+1)(2^8+1)...(2^32+1)/(2-1)(2^2-1)=(2^64-1)/(2-1)(2^2-1)=1/3*(2^64-1)
前面乘个(2-1)(2^2-1)/(2-1)(2^2-1)
原式子化成(2-1)(2^2-1)(2^2+1)(2^4+1)(2^8+1)...(2^32+1)/(2-1)(2^2-1)=(2^64-1)/(2-1)(2^2-1)=1/3*(2^64-1)