Finding prime number - formula

By ==C.P. Willians== 1964

nth prime = 1+i=02n(nj=1i(cosπ(j1)!+1j)2)1n1+\sum_{i=0}^{2^n} (\frac{n}{\sum_{j=1}^i (cos{\pi\frac{(j-1)!+1}{j}})^2})^\frac{1}{n}

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