A brilliant number is defined as a whole number that is the product of just two prime factors, both of which have the same number of digits in base 10. For example, 21 (=3x7) and 25 (5x5) are 2-digit brilliant numbers but 77 (=7x11) is not; 143 (=11x13) is a 3-digit brilliant number.
Find the minimal and the maximal 3-digit brilliant numbers.
You may wish to try this question first: calculate the minimal and maximal 2-digit brilliant numbers.
This space is here to avoid seeing the answers before trying the problem!
If you enjoy using this website then please consider making a donation - every little helps :-)
You can receive these questions directly to your email box or read them in an RSS reader. Subscribe using the links on the right.
Don’t forget to follow Gifted Mathematics on Google+, Facebook or Twitter. You may add your own interesting questions on our Google+ Community and Facebook..
You can also subscribe to our Bookmarks on StumbleUpon and Pinterest. Many resources never make it onto the pages of Gifted Mathematics but are stored in these bookmarking websites to share with you.