### Evil numbers

In arithmetic, there are common terms such as rational numbers, irrational numbers, whole numbers, natural numbers etc. Here are some less known numbers:

1) Evil numbers: Numbers with a binary representation with even number of 1s. An example of an evil number is pi

2)Happy numbers

3) Unhappy numbers, ie numbers which are not happy.

4) Wasteful numbers: If x is a wasteful number, its prime factorisation has more digits (including the powers)than the number of digits of x. An example is 4,6,8,9,12,18 etc.

5) Frugal numbers: A non wasteful number and 1.

6) Economic numbers: Frugal numbers excluding 1.

7) I like this one the most: Lucky numbers

There are many other types of numbers. Here's a nice article on number gossip.

## 6 Comments:

Haha lucky numbers. Not so lucky to me........ better buy 4D instead!

Dude, here is another link for you to add

http://mathforum.org/dr.math/

Useful for teachers like us to consult on how to explain a certain concepts too.

What is the binary intepretation of pi? Can you even represent it in binary? But then the link says another definition of evil numbers.

oh i mean representation, not intepretation

Where is my favourite algebraic numbers? :P

very nice

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