MoebiusMu
MoebiusMu[n] gives the Möbius function .
Integer mathematical function (see Section A.3.10). is if is a product of an even number of distinct primes, if it is a product of an odd number of primes, and if it has a multiple prime factor. See The Mathematica Book: Section 3.2.4. See also: Divisors, FactorInteger, JacobiSymbol.
Further Examples
MoebiusMu[n] gives the Möbius function 
. 
is 
if 
is a product of an even number of distinct primes, 
if it is a product of an odd number of primes, and 
if it has a multiple prime factor. 
