TITLE: Properties of the number 50
QUESTION [20 upvotes]: I will shortly be engaging with my 50th (!) birthday.
50 = 1+49 = 25+25 can perhaps be described as a "sub-Ramanujan" number.
I'm trying to put together a quiz including some mathematical content. Contributions most welcome. What does 50 mean to you?

REPLY [2 votes]: 50 is half the sum of the first nine prime numbers
A lot more here:
https://primes.utm.edu/curios/page.php?short=50