Möbius Mu function
From Conservapedia
The Möbius mu function denoted 
supported on the natural numbers and has implications in number theory. It has the value,
if 
has a prime factor of power higher than 1
if is prime or has an odd number of prime factors
if has an even number of prime factors
The first 10 values are
| n | factors |
|
|---|---|---|
| 1 | n/a | 1 |
| 2 | 2 | -1 |
| 3 | 3 | -1 |
| 4 | 
|
0 |
| 5 | 5 | -1 |
| 6 | 2,3 | 1 |
| 7 | 7 | -1 |
| 8 | 
|
0 |
| 9 | 
|
0 |
| 10 | 2,5 | 1 |
