Ensembles de densité nulle contenant des entiers possédant au plus deux facteurs premiers Original Research Article

Let t, rset membership, variantimage, αset membership, variantimage, with 2less-than-or-equals, slanttrα and r>r0(α), we prove that there exists infinitely many integers with at most two prime factors and having no digit exceeding t−1 in their base r expansion. When t=r−1 this result holds whenever rgreater-or-equal, slanted5.