Prime Number Distributions

Here's an interesting article that was a hot topic around the dinner table:

https://www.newscientist.com/article/2080613-mathematicians-shocked-to-find-pattern-in-random-prime-numbers/

Prime numbers (other than 2 and 5) must end in a 1,3,7 or 9.  Over the first few hundred million prime numbers, researchers found that a prime ending in 1 is followed by another prime ending in 1 just 18.5 per cent of the time instead of a more or equal distribution of 25 per cent.