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math.NT2015
Almost prime triples and Chen's Theorem
D. R. Heath-Brown, Xiannan Li
We show that there are infinitely many primes such that not only does have at most two prime factors, but also has a bounded number of prime divisors. This refi…
math.NT2015
Primes values of
D. R. Heath-Brown, Xiannan Li
We prove an asymptotic formula for the number of primes of the shape , thereby refining the well known work of Friedlander and Iwaniec. Along the way, we prove a result o…