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Integers without divisors from a fixed arithmetic progression

William D. Banks, John B. Friedlander, Florian Luca

math.NTarXiv:math/0604036

Abstract

Let a be an integer and q a prime number. In this paper, we find an asymptotic formula for the number of positive integers n < x with the property that no divisor d > 1 of n lies in the arithmetic progression a modulo q.

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