Consider the following sequence:
5 1 1 5 1 4 7 5 1 2 8 4 1 4 7 8 6 8 6 9 1 4 7 9 5 2
How many such numbers are present in the above arrangement, each of which is immediately preceded by its factor and followed by an even number?
1
Zero
2
One
3
Two
4
Three