References to A066301

a(n) = if n is squarefree then 0 else 1+a(n/sfk(n)), where sfk=A007947 (squarefree kernel).
0, 0, 0, 1, 0, 0, 0, 2, 1, 0, 0, 1, 0, 0, 0, 3, 0, 1, 0, 1, 0, 0, 0, 2, 1, 0, 2, 1, 0, 0, 0, 4, 0, 0

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