What are Unfactorable Numbers?
A number is called "unfactorable" if it cannot be expressed as the product of simpler numbers, i.e., if it is not factorizable. For example, the number 12 is factorizable because it can be written as 2 x 2 x 3, while the number 15 is unfactorable because it cannot be expressed as the product of simpler numbers.
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