4,8,16,32,( )( ) 243,81,27,9 ( )( )2.5.11.23.47( )( ) 8.24.12.36.18.( )( )

4,8,16,32,( )( ) 243,81,27,9 ( )( )2.5.11.23.47( )( ) 8.24.12.36.18.( )( )
4,8,16,32,( )( ) 243,81,27,9 ( )( )2.5.11.23.47( )( ) 8.24.12.36.18.( )( )

4,8,16,32,( )( ) 243,81,27,9 ( )( )2.5.11.23.47( )( ) 8.24.12.36.18.( )( )
4,8,16,32,( 64)(128 ) 后一项是前一项乘以2
243,81,27,9 ( 3)(1 ) 后一项是前一项除以3
2.5.11.23.47( 95)( 191) 后一项是前一项乘以2加1
8.24.12.36.18.( 48)(26 ) 奇数项差 4 6 8 …… 偶数项差 12

64 128
3 1
95 191
4 8