How many pairs (w, w+1) have one or more prime factors common, where w is an integer and 2 ≤ w ≤9 ?  Choose the correct choice from the following options:	A) 0	B) 1	C) 2	D) 3	E) 4
w and w+1 are consecutive integers.   Two consecutive integers are co-prime, which means that they don't share ANY common factor but 1. For example 20 and 21 are consecutive integers, thus only common factor they share is 1.   0nswer: 0.
<result>A</result>
How many pairs (w, w+1) have one or more prime factors common, where w is an integer and 2 ≤ w ≤9 ?