Great Site: What’s Special About This Number?

Last week, I stumbled on this fun site. It’s a running list of numbers with an indication about what is special about that number.

Stuff like …

and just a few of my favorites from the first 100

40 is the only number whose letters are in alphabetical order
53 is the only two digit number that is reversed in hexadecimal
67 is the smallest number which is palindromic in bases 5 and 6
77 is the largest number that cannot be written as a sum of distinct numbers whose reciprocals sum to 1

The site is also full of links to fun and interesting math topics – if you find math fun and interesting.

April 7, 2009 | Filed Under Fun