(1)二级等差数列:
2,3,5,8,()
A.8B.9C.15 D.12
(2)等差数列变式:
3,4,6,9, (), 18
A.11 B.13C.12D.18
(3)二级等比数列:
1,3,18,216, ()
A.1023B.1892C.243D.5184
(4)等比数列的变式:
3,5,9,17, ()
A.23 B.33C.43D.25
(5)暗的平方数列:
2,3,10,15,26,35,()
A.40 B.50 C.55D.60
(6)暗的立方数列:
3, 10, 29, 66, ()
A.123 B.124 C.126D.127
(7)质数的变式:
20, 22, 25, 30, 37, ()
A.40 B.42C.48D.50
(8)双重数列:分为单数项与双数项(或奇数项与偶数项)。
257,178,259,173,261,168,263, ()
A.275B.279C.164D.163
(9)数量递增的差数列:
2, 4, 8, 14, 22,()
A.30B.31C.32D.33
(10)正负数间隔等比数列:
-2, 4, -8, 16, ()
A.31B.-32C.33D.-34
(11)差数列变式:.
3,4,6,9, (), 18
A.12B.13C.14D.15
(12)整数与小数数列:
1.1, 2.2, 4.3, 7.4, 11.5, ()
A.15.5B.15.6C.15.8D.16.6