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Let denote the set of positive integers which are divisible by the product of their nonzero digits. In this note, we show that if is large, then .
Cite this article
Florian Luca, Jean-Marie De Koninck, Positive integers divisible by the product of their nonzero digits. Port. Math. 64 (2007), no. 1, pp. 75–85DOI 10.4171/PM/1777