There's a prime number that's the sum of the first 17 powers of 2 - Apparently.
In 1903, American mathematician William H. Mills discovered a prime number that is the sum of the first 17 powers of 2. This number, 2^17 + 2^16 + ... + 2^1 + 2^0, is a prime number with 18 digits. What's remarkable is that Mills' discovery was more than a century ago, yet it was only in the 1980s that the number was officially recognized as prime. This fact highlights the sometimes surprising and counterintuitive nature of prime numbers.