The formula on the right is the number of x+ 1 1. The formula is as above, that is, when x= 1, the right side = 1 1, and when x=5, the right side is equal to116544.

This is an infinite tower.

When there are conditions (divide the left side after summing up and rearrange it into the correct answer)

The auxiliary tower has only nine floors. When the 9 th floor is 9, the left side is equal to 9 1, and when 9 is split into 1, it is equal to the right side.

But when the floor is 10, the left side is equal to 10 1, and 10 cannot be taken as the demolition object to become the right side, and the logic is untenable.

(or under similar restrictions, the secondary tower has only 9 floors)