--- title: "A Mathematical Curiosity" date: 2019-08-13T18:51:00 draft: true type: "post" --- *Originally posted on my [old old private blog](https://artofproblemsolving.com/community/c922786h1895231_a_mathematical_curiosity)* An interesting mathematical curiosity: $$\sum_{n=2}^{\infty} \sum_{p=2}^{\infty} \frac{1}{n^p} = 1$$ As a challenge, try to prove it!