关于“幸运数”的计数问题

On the Counting Problems of Lucky Numbers

如果正整数b的各位数字之积等于正整数a,则称b为a的幸运数.本文证明了幸运数存在性定理,并归纳得到了关于幸运数计数问题的两个命题.

If the product of each number in positive integer b equals a positive integer a,then b is called a＇s lucky number. In this paper the existence theorem of lucky number is proved and two propositions are induced from the counting problem of lucky numbers.