17,49,193,961,()
A.2083
B.3007
C.5761
D.7785
5,17, 21, 25,() A、29;B、36;C、41;D、49
1 , 3 , 7 , 17 , 41 , ()A . 49 B . 50 C . 89 D . 99
1,7,(),31,49,71 A.9 B.11 C.17 D.19
15, 17,20,25,32, ()。A.35B.43 C.49 D.51
1, 3, 7, 17, 41, () A.49 B.50 C.89 D.99