Question

2,3,7,45,2017,( )A.4068271 B.4068273 C.4068275 D.4068277选哪个?

Answer 1

3=2^2-1=2^2-2^0

7=3^2-2=3^2-2^1

45=7^2-4=7^2-2^2

2017=45^2-8=45^2-2^3

规律：第n项的值等于它前一项的平方-2的(项数-1)次方

下一项：2017^2-2^4=4068289-16=4068273

选B