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**Is the distribution of "almost-primes" known.**

If we define the "Almost-primes" as:

* [tex] p^{a} [/tex] a is positive integer and p is a prime

* pq where p and q are both primes

then my question is if their distribution known ?? i mean if there is a function f(x) so for f(N) gives the values of "almost prime numbers" from 1 to N