Triangular numbers are the numbers of balls needed to form a triangle i.e.
1, 3, 6, 10, 15, 21, 28, 36, 45, 55, ...
e.g. 15 (http://upload.wikimedia.org/wikipedia/commons/3/34/Square_triangle_sum_16.png)
e.g. 25 (http://upload.wikimedia.org/wikipedia/commons/f/f8/Square_triangle_sum_25.png)
Now for the interesting bit.
Every positive interger can be represented as the sum of up to 3 triangular numbers. Geez!
You better delete this before 5ive Times see's it and has a moan about someone starting a new thread
Quote from: SuperSub on September 02, 2007, 10:49:25 PM
You better delete this before 5ive Times see's it and has a moan about someone starting a new thread
a) I used the search option to find the original thread - it didnt work
b) 5 is not a triangular number so he/she can feck off
Here's something else that is Interesting
The name Hells Angels was coined by a squadron of World War I fighter pilots.
The Hells Angels Motorcycle Club (HAMC) was formed in 1948 in Fontana, California, the name "Hells Angels" was inspired by the name of the U.S. Air Force 303rd Bombardment Groups in the early years of World War II. In the UK the Hells Angels London chapter credits their founding on the Beatles. Allegedly the Beatles invited a couple of members of the HAMC San Francisco, to London, following which it was decided to create English charters of the club