 2  1.41421356237  1.25992104989
 4  2              1.58740105197
 6  2.44948974278  1.81712059283
 8  2.82842712475  2                   64
10  3.16227766017  2.15443469003
12  3.46410161514  2.28942848511
14  3.74165738677  2.41014226418
16  4              2.51984209
18  4.24264068712  2.62074139421
20  4.472135955    2.71441761659
22  4.69041575982  2.80203933066
24  4.89897948557  
26  5.09901951359  2.96249606841
28  5.29150262213  3.03658897188
30  5.47722557505  3.10723250595
64  8              4
100 10             ??