Bounds On The Prime-counting Function
The prime number theorem is an asymptotic result. Hence, it cannot be used to bound π(x).
However, some bounds on π(x) are known, for instance Pierre Dusart's
The first inequality holds for all x ≥ 599 and the second one for x ≥ 355991.
A weaker but sometimes useful bound is
for x ≥ 55. In Dusart's thesis there are stronger versions of this type of inequality that are valid for larger x.
The proof by de la Vallée-Poussin implies the following. For every ε > 0, there is an S such that for all x > S,
Read more about this topic: Prime Number Theorem
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