Every number is interesting. Take for example :
- \(1\) is neither a prime nor composite
- \(2\) is the first & the only even prime
- \(3\) is the first odd prime
- \(4\) is the first composite number
& so on.
But is there an uninteresting number? Let us find out.
Let \(U\) be the set of all the uninteresting numbers.
Obviously, this set has a smallest element.
But such a number would be interesting because it is the first uninteresting number!
Hence, EVERY number is interesting!