Today’s December 23rd, so we’re going to take a look at the number 1223. It just so happens that 1223 is the 200th prime number! 1217 is the 199th prime, and 1229 is the 201st prime.

There’s more to the number 1223 than it being a prime; it’s also a Sophie Germain Prime, which means that twice its value plus one is another prime:

1223×2 + 1 = 2447 is also a prime.

This year is a leap year, so its the 358th day of the year today. Some special facts about the number 358:

• 358 is the sum of six consecutive primes (47, 53, 59, 61, 67, and 71)
• The sum of the first 358 primes is also prime

That’s it for today. Check back in later for more interesting math facts!