Today we’re going to look at some interesting facts about the number 1224. There actually isn’t too much to note here, but one interesting tidbit is that there are 1224 pairs of twin primes under 100,000. That includes pairs like (3, 5), (5, 7), and (7211, 7213).

More interestingly, we can see that it’s the 359th day of the year. This year is a leap year, so this number is one higher than usual for today. The number 359 is interesting because it’s an “emirp”. That means that it’s not only a prime, but it’s also a prime when its digits are reversed (953).

359 is also a Sophie Germain prime, like in yesterday’s article, but it is also a safe prime:

179 is prime, and 179*2 + 1 = 359 (another prime)

359 is prime, and 359*2 + 1 = 719 (another prime)