A.2473
B.2485
C.1685
D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857
[单选题]1,5,19,81,411,( )。A.2473B.2485C.1685D.1857