1,5,21,85,,
问题描述:
1,5,21,85,,
答
(1×4)+1=5
(5×4)+1=21
……
1,5,21,85,341,1365
1,5,21,85,,
(1×4)+1=5
(5×4)+1=21
……
1,5,21,85,341,1365