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Prime count question


Let pi(x) be the number of primes greater than or equal to x.

Then how do I find, through Mathematica, x such that

t(x) = pi(x) / ((x/ln(x))*(1+1/ln(x) + 2.51/(ln^2(x))))

is the highest t(y) such that  599 <= y <= 355991?

Many thanks in advance -- thanks also to those who helped with my
previous question.



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