40003

This number is a composite.

Just showing those entries submitted by 'Loungrides': (Click here to show all)

The smallest "extremely naughty" brilliant number, 40003=109*367, i.e., a brilliant number whose all digits are zeros except for the first and last digits. Note that the concatenation in order of its prime factors, i.e., 109367, is an emirp. [Loungrides]