7^24-1＝（7^12+1）(7^12-1)=(7^12+1)(7^6+1)(7^6-1)=(7^12+1)(7^6+1)(7^3+1)(7^3-1)=(7^12+1)(7^6+1)(7+1)(7^2-7+1)(7-1)(7^2+7+1)=8x6x43x57x(7^12+1)(7^6+1)=48x43x57x(7^12+1)(7^6+1)所以是 48和 43