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Infinite products with strongly $$B$$-multiplicative exponents. (English) Zbl 1174.11006
In the first part of the paper, the authors generalize the notion of strongly $$B$$-multiplicative sequence and prove the convergence of infinite products of the type $$\prod _{n\geq \delta _k} \left( \frac{Bn+k}{Bn+k+1} \right)^{u(n)}$$, where $$B>1$$ is integer, $$u(n)_{n\geq 0}$$ satisfies their definition and has additional properties, $$k$$ is a non-negative integer less than $$B$$, and $$\delta _k$$ is 1 if $$k=0$$ and 0 otherwise. The rest of the article is devoted to computing some infinite products of the kind and their additive counterparts. Appropriate specializations of the main results yield values to some infinite products associated with counting the sum of digits or the number of occurrences of several given digits in the base $$B$$ expansion of an integer.

##### MSC:
 11A63 Radix representation; digital problems 11Y60 Evaluation of number-theoretic constants