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We present new several sharper and sharper lower and upper bounds for the
non-zero Bernoulli numbers using Euler's formula for the Riemann zeta function.
As a particular case, we determine the best possible constants $ \alpha $ and $
\beta $ such that the double inequality $$ \frac{2\cdot (2k)!}{\pi^{2k}
(2^{2k}-1)}\frac{3^{2k}}{(3^{2k}-\alpha)} < \vert B_{2k} \vert < \frac{2\cdot
(2k)!}{\pi^{2k} (2^{2k}-1)}\frac{3^{2k}}{(3^{2k}-\beta)}, $$ holds for $ k = 1,
2, 3, \cdots.$ Our main results refine the existing bounds of $ \vert B_{2k}
\vert $ in the literature.
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