## 10/10/10 10:10:10

I found Sean Burke’s post 10/10/10: “the Answer to the Ultimate Question of Life, the Universe, and Everything” and was able to post this in time so you all can look at your clock and marvel how it turns to the date 10/10/10 and maybe even at the time 10:10:10.

The other day I was thinking of the number 51 and how it is a natural number that is the product of two prime numbers just like 10 is. I then tried to figure out some other numbers and came to a number sequence like this 4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 46, 49, 51. It was first today when I clicked the Wikipedia link for 42 (that is in binary 101010) in his post and then navigated around that it hit me that this type of number is a Semiprime. I knew the meaning of it and have even been using it in programming but seem to have forgot the name “Semiprime” describing these numbers.

Semiprimes are used for cryptography and other areas. It is a fact that finding two large primes and multiplying them together is simple, but finding the original factors is very difficult or take a very long time.

That is how much geek I am.