$\omega$(N) (little omega) returns the count of distinct prime factors of a positive integer N.
$\Omega$(N) (big omega) returns the count(with multiplicity) of prime factors of a positive integer N.
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$\omega$(N) (little omega) returns the count of distinct prime factors of a positive integer N.
$\Omega$(N) (big omega) returns the count(with multiplicity) of prime factors of a positive integer N.