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Published online by Cambridge University Press: 26 February 2010
In 1941 Duffin and Schaeffer [2] considered the case k = 1 of the assertion that when
the statement;
(Ak) “For almost all
there are infinitely many natural numbers q for which there exist integers a1,…, ak such that (a1 … ak, q) = 1 and

where 
holds, if, and only if,
diverges.