A fraction containing each of the digits 1 through 9 is called a pandigital fraction. The following table gives the number of pandigital
fractions which represent simple unit fractions.
The numbers of pandigital fractions for 1/1, 1/2, 1/3, ... are 0, 12, 2, 4, 12, 3,
7, 46, 3, ... (OEIS A054383).