"Brilliant numbers, as defined by Peter Wallrodt, are numbers with two prime factors of the same length (in decimal notation). These numbers are generally used for cryptographic purposes, and for testing the performance of prime factoring programs.

The challenge is to continue the table shown on the website. This table contains the least brilliant number with an even number of digits and the greatest brilliant number with an odd number of digits."

http://www.alpertron.com.ar/BRILLIANT.HTM#2br

This website shows a huge table of 2-brilliant, 3-brilliant, and 4-brilliant numbers. It has computations and factorization for numbers with all the way up to 150 digits! If you don't know exactly what I mean about 2,3,4-brilliant numbers, you should look at the website. It is very interesting and the tables will help it make more sense.