summary:Let Pr denote an almost-prime with at most r prime factors, counted according to multiplicity. Suppose that a and q are positive integers satisfying (a,q)=1. Denote by P2(a,q) the least almost-prime P2 which satisfies P2≡a(modq). It is proved that for sufficiently large q, there holds P2(a,q)≪q1.8345. This result constitutes an improvement upon that of Iwaniec (1982), who obtained the same conclusion, but for the range 1.845 in place of 1.8345
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