26 Aug 2013

Brilliant Numbers: Upper Primary Mathematics Competition Question


A brilliant number is defined as a whole number that is the product of just two prime factors, not necessarily distinct, both of which have the same number of digits in base 10. For example, 21 (=3x7) is a 2-digit brilliant number but 77 (=7x11) is not.

Find the smallest and the largest 2-digit brilliant numbers.





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