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The theory of uniform approximation of real numbers motivates the study of products of consecutive partial quotients in regular continued fractions. For any non-decreasing positive function: N>₀ and N, we determine the Lebesgue measure and Hausdorff dimension of the set F_ () of irrational numbers x whose regular continued fraction x~=~a₁ (x), a₂ (x), is such that for infinitely many n there are two numbers 1 j<k n satisfying \ a₊ (x) a₊+-₁ (x) (n), \; a₉ (x) a₉+-₁ (x) (n). \ One of the consequences of the results is that the strong law of large numbers for products of consecutive partial quotients is impossible even if the block with the largest product is removed.
Brown-Sarre et al. (Fri,) studied this question.