The smallest value of n, for which 2n+1 is not a prime number, is Choices:
A) 3	B) 4	C) 5	D) None	E) 6
Solution   (2×1 + 1)	= 3.   (2×2 + 1)	= 5.   (2×3 + 1)	= 7.   (2×4 + 1)	= 9.   which is not prime ,	n=4.   Answer 4
<result>B</result>
The smallest value of n, for which 2n+1 is not a prime number, is