I am a little confused. When it says that each square corresponds to n sequential numbers, does it mean that the first square is the first n, and the second square (which is on the second row) is the first n after those, and the third square (also in the second row) has the first n after those, and so on,

Or, do the regions overlap?

I tried to look at the first 4 rows for n=5, but did not see the pattern depicted (each interval had a prime in it).

Am I interpreting what is meant by the blocks incorrectly, or does the pattern not work for small enough n?