For extra clarity............the first 10 numbers obtained from taking the differences of squares.................9 is the 1st non prime.............again, compare that with 10 negative 9's from overlapping the pf with the negative numbers................done in cycles.............for every 10 negative numbers..............starting the pf again.........b/c there are ten numbers in the pf.....

A dot is next to the primes..........it ends with a non prime.............the location of the 2nd zero in the R. zeta function.......................

3	.
5	.
7	.
9
11	.
13	.
15
17	.
19	.
21