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In this note, we extend Euler's transformation formula from the alternatingseries to more general series. Then we give new expressions for the Riemannzeta function $\zeta(s)$ by the generalized difference operator $\Delta_{c}$,which provide analytic continuation of $\zeta(s)$ and new ways to evaluate thespecial values of $\zeta(-m)$ for $m=0,1,2,\ldots$. Applying these results, wefurther extend Huylebrouck's generalization of Wallis' well-known formula for$\pi$ in the half planes Re$(s)>0$ and Re$(s)>-1$, respectively. They implyseveral interesting special cases including $$\frac{2\pi}{3^{\frac{3}{2}}}=\frac{3^{\frac{4}{3}}}{2^{\frac{4}{3}}}\frac{2^{\frac{1}{3}}\cdot3^{\frac{1}{3}}\cdot3^{\frac{1}{3}}\cdot4^{\frac{1}{3}}\cdot6^{\frac{2}{3}}\cdot6^{\frac{2}{3}}}{4^{\frac{1}{3}}\cdot4^{\frac{1}{3}}\cdot5^{\frac{1}{3}}\cdot5^{\frac{1}{3}}\cdot4^{\frac{2}{3}}\cdot5^{\frac{2}{3}}}\cdots,$$ $$  3^{\gamma-\frac{\log3}{2}}=\frac{3^{\frac{1}{3}}\cdot3^{\frac{1}{3}}}{2^{\frac{1}{2}}\cdot4^{\frac{1}{4}}}\frac{6^{\frac{1}{6}}\cdot6^{\frac{1}{6}}}{5^{\frac{1}{5}}\cdot7^{\frac{1}{7}}}\frac{9^{\frac{1}{9}}\cdot9^{\frac{1}{9}}}{8^{\frac{1}{8}}\cdot10^{\frac{1}{10}}}\cdots,$$ and $$ \left(3\left(\frac{2\pie^{\gamma}}{A^{12}}\right)^{2}\right)^{\frac{\pi^2}{18}}=\frac{3^{\frac{1}{3^2}}\cdot3^{\frac{1}{3^2}}}{2^{\frac{1}{2^2}}\cdot4^{\frac{1}{4^2}}}\frac{6^{\frac{1}{6^2}}\cdot6^{\frac{1}{6^2}}}{5^{\frac{1}{5^2}}\cdot7^{\frac{1}{7^2}}}\frac{9^{\frac{1}{9^2}}\cdot9^{\frac{1}{9^2}}}{8^{\frac{1}{8^2}}\cdot10^{\frac{1}{10^2}}}\cdots,$$where $\gamma$ is the Euler-Mascheroni constant and $A$ is theGlaisher-Kinkelin constant.

Euler's transformation, zeta functions and generalizations of Wallis' formula