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User:Jason Kimberley/A001221

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Sequences derived from A001221: a(n) is the number of distinct primes dividing n.

$r$
$k$	any	is prime	is even	1	2	3	$\geq 3$	4
1	A000027	A064040	A030231	A246655	A007774	A033992	A000977	A033993
2					A074851	A140077

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