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Cantidad de Números Primos $\mathrm{\Phi }(n)=$

${\displaystyle \pi =\sqrt{6\cdot \prod _{i=1}^{\mathrm{\infty }}\frac{1}{1-(p_i{)}^{-2}}}=\prod _{i=1}^{\mathrm{\infty }}{f}_i}$

${\displaystyle \pi \approx \prod _{i=1}^{\mathrm{\Phi }(n)}{f}_i=}$

$n=$