Is the question flawed? It seems to me, 3, 5 and 7 are the 3rd, 4th and 5th primes, which fits the x, y, z requirement.
So for an answer, pi seems wrong. 31, 47 and 59 are not consecutive primes (since they missed 37, 41, 43). And, they fail the other criteria where you take the first three digits 315, sum them to get 9 which are supposed to equal the sum of the prime factors in the second three digits, 759, which is 7 plus 5 = 12, so pi fails this test as well.
After going from 11 to 97 and looking for consecutive primes that pass the N split test, I found none. So is the question flawed, or can you clarify the "N is split in the middle into two separate numbers, the prime factors of the left part of N add up to its right part" requirement?