Möbius Inversion Formula
If 
, then
where the sums are over all possible Integers
that Divide 
and 
is theMöbius Function. The Logarithm of the Cyclotomic Polynomial
is the Möbius inversion formula.See also Cyclotomic Polynomial, Möbius Function
References
Hardy, G. H. and Wright, W. M. An Introduction to the Theory of Numbers, 5th ed. Oxford, England: Oxford University Press, pp. 91-93, 1979. Schroeder, M. R. Number Theory in Science and Communication, 3rd ed. New York: Springer-Verlag, 1997. Vardi, I. Computational Recreations in Mathematica. Redwood City, CA: Addison-Wesley, pp. 7-8 and 223-225, 1991.
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