There are some mind-bogglingly large numbers in that article. For example, the largest known pair of prime numbers that are 2 numbers apart are 3,756,801,695,685 x 2666,669 – 1 and 3,756,801,695,685 x 2666,669 + 1.
Such pairs of numbers are known as "twin primes". Some other examples are 3 and 5, or 11 and 13.
A famous unproven mathematical conjecture is that there are an infinite number of such twin primes.
The discovery or proof of the outsider mathematician Yitang Zhang described in the article does not go so far as to prove that there are an infinite number of such twin primes, but rather proves that there must be an infinite number of pairs of prime numbers that are closer than 70 million apart.
