1,4,7,10,( ),16

问题描述:

1,4,7,10,( ),16
5,6,8,12,20,( )
1,2,5,10,17,( )

1,4,7,10,(13 ),16 (规律:每个加3得后一个数)
5,6,8,12,20,(36 ) (规律:加1 2 4 8 16 )
1,2,5,10,17,(26 )(规律:加1 3 5 7 9)