# Number Dictionary

This is a fun little website that offers information on numbers from 1 to 1000000:

For example, I put in one of my favorite numbers, 144, and saw four ways to write 144 as a difference of squares (always a useful little trick) and five ways to write it as the sum of primes (in case we were trying to verify Goldbach’s conjecture).

I find the Mayan representation of 144 really cool, and the Roman Numeral representation will make this website handy for crossword puzzles!

## 2 Comments

## Alan · January 2, 2011 at 3:42 pm

Who ever knew 23 was the difference of two squares, being 23 = 12^2 – 11^2. Well, I bet someone must have known. I guess I haven’t thought about it, although I love the number 23.

## MrHonner · January 3, 2011 at 9:25 pm

Just because of that absurd movie, I imagine.