FourtySeven
Since Nov 7, 2001
 

47 is an interesting number in it's on right. You can generate a sequence of primes by starting with 2, then multiplying each number by 2 and adding 1. 47 is the last prime in this sequence before you produce a composite number
Here's the sequence:
2,5,11,23,47
The next number is 95, which is a composite. (The proof of which is left as an exercise).
Another wrote to me in FReepmail:
I thought it might be referencing “Black ‘47” the worst year of the ‘Famine”. Actually, the worst year of the genocide!
https://en.wikipedia.org/Wiki/Black_47
FourtySeven remains an enigma! Well maybe not so much...
I also like to chat occasionally on Paltalk where I am known as Fact Checker