The primes in the pf are ........2, 3, 5, 7, 11............................there is a jump from 7 to 11........that is not only a difference of 4............but from single primes to double digit primes.................1 and 2..........like 1/2.

Add to that that the 1st jump in the difference between successive pairs of numbers.........starting from 0..........................happens at 4 and 3.......................4 + 3 = 7.....................4 * 3 = 12.................7 - 12........is like 7 - 11..............................