P(n)はn番目の素数
|1+e^(i*1/2)+e^(i*1/3)+e^(i*1/5)+・・・+e^(i*1/P(n-1))+e^(i*1/P(n))|=(n+1)
1<k<n+1
[Σcos(1/P(k))]^2+[Σsin(1/P(k))]^2=(n+1)^2