找规律:1.5,4.5,13.5,(),121.5……1,5,9,13,……第10个数是()

问题描述:

找规律:1.5,4.5,13.5,(),121.5……
1,5,9,13,……第10个数是()

第十个数是41

1.5,4.5,13.5,40.5,121.5
1,5,9,13,17,21,25,29,33,37