Arithmetic derivative: Difference between revisions

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;* [[oeis:A003415|OEIS:A003415 - a(n) = n' = arithmetic derivative of n.]]
;*[[wp:Arithmetic_DerivativeArithmetic_derivative|Wikipedia: Arithmetic Derivative]]
 
 
=={{header|Python}}==
<lang python>from sympy.ntheory import factorint
 
def D(n):
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