### All numbers are interesting

Supppose that there is some (positive) integer which is not interesting. In particular, let

*U*be the set of all numbers which are not interesting. Then

*U*must have a least element element

*n*. Now

*n*is the smallest number which is not interesting. But that makes

*n*interesting indeed!

## 2 Comments:

old one. i have heard it 100 times

before.

for me, only even primes are interesting.

- raghav

all natural numbers except the primes are uninteresting, they only appear in stupid and boring combinatorial calculations.

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