Evil number
A kind of number
About Evil number
An evil number is a non-negative integer that has an even number of 1s in its binary expansion. The name is a wordplay on "even" (e.g. 3 = 11₂ has two 1s).
Key features
- 0 is evil (zero 1s).
- Odious numbers are those with an odd number of 1s in binary.
Examples: