A positive integer n with n\ge3 is called a Nella\:number if there exists a positive integer x with x<n and there exists a positive integer m such that
- m is not divisible by x or by x+1, and
- m is divisible by every other positive integer between 1 and n inclusive.
For example, n=7 is a Nella number. How many Nella numbers n are there with 50\le n\le2017?
Answer Choices
A. 393
B. 394
C. 395
D. 396
E. 397