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Mertens' Theorem say (page 65, An Introduction to Sieve Methods and Their Applications, Cojocaru and Murty):

$$ \displaystyle\prod_{p< x}\left(1-\frac 1p\right)=\frac{e^{-\gamma}}{\log x}\left(1+O\left(\frac{1}{\log x}\right)\right), $$

where $\gamma$ is the Euler-Mascheroni constant.

Mertens' Theorem says (page 65, An Introduction to Sieve Methods and Their Applications, Cojocaru and Murty):

$$ \displaystyle\prod_{p< x}\left(1-\frac 1p\right)=\frac{e^{-\gamma}}{\log x}\left(1+O\left(\frac{1}{\log x}\right)\right), $$

where $\gamma$ is the Euler-Mascheroni constant.

Merten's Theorem say (page 65, An Introduction to Sieve Methods and Their Applications, Cojocaru and Murty):

$ \displaystyle\prod_{p< x}\left(1-\frac 1p\right)=\frac{e^{-\gamma}}{\log x}\left(1+O\left(\frac{1}{\log x}\right)\right), $

where $\gamma$ is the Euler's constant.

Mertens' Theorem say (page 65, An Introduction to Sieve Methods and Their Applications, Cojocaru and Murty):

$$ \displaystyle\prod_{p< x}\left(1-\frac 1p\right)=\frac{e^{-\gamma}}{\log x}\left(1+O\left(\frac{1}{\log x}\right)\right), $$

where $\gamma$ is the Euler-Mascheroni constant.

Merten's Theorem say (page 65, An Introduction to Sieve Methods and Their Applications, Cojocaru and Murty):

$ \displaystyle\prod_{p< x}\left(1-\frac 1p\right)=\frac{e^{-C}}{\log x}\left(1+O\left(\frac{1}{\log x}\right)\right), $

where $C$ is a positive constant.

Merten's Theorem say (page 65, An Introduction to Sieve Methods and Their Applications, Cojocaru and Murty):

$ \displaystyle\prod_{p< x}\left(1-\frac 1p\right)=\frac{e^{-\gamma}}{\log x}\left(1+O\left(\frac{1}{\log x}\right)\right), $

where $\gamma$ is the Euler's constant.