The primality of the table for n=5 is equal to 3 ?

I understood)
for n=5 answer 4 )

I found

Edited by author 22.10.2013 07:58

if n=5 then matrix view that:
1 20 19 18 17
2 21 22 15 16
3 24 23 14 13
4 25 8 9 12
5 6 7 10 11
???

13 14 17 18 19
12 15 16 21 20
11 10 9  22 23
2  1  8  7  24
3  4  5  6  25

Edited by author 16.02.2017 22:14