# Asymptotic formula for almost primes

I have developed a formula for almost primes which is far more accurate asymptotically than Landau's well known

$$\pi_k(n) \sim \left( \frac{n}{\log n} \right) \frac{(\log\log n)^{k-1}}{(k - 1)!}$$

(Landau's is not good for high $n$, whereas the one I have been working on actually gets more accurate the higher $n$ becomes - see here.)

Is this of any significance?

Just out of interest, I have included some plots up to $n=9$:

where actual is green, Landau is blue, & mine is red.

(Note: I have changed the scale in each one.)

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@martin yes, it does matter (since it means that your formula might not be more accurate for very large $n.$) I would writing up your ideas, and talking to a number theorist. You have to write things very carefully (include the results of your experiments), lest they take you for a crank. If they think you are serious, they will be happy to talk. – Igor Rivin Dec 15 '13 at 15:47