2,1,5,7,17,()
A.26
B.31
C.32
D.37
2,1,5,7,17,()A.26 B.31 C.32 D.37
:1,5,7,17,()A.29B.31C.33D.37
5, 3, 7, 9, 15, 23, ()。A.27B.31C.35D.37
2,1,5,7,17,() A.26 B.31 C.32 D.37
0,1/5,1/5,3/17,2/13() A.2/13B.19/7C.7/25D.5/37
2,1,5,7,17,() A.26 B.31 C.32 D.37