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Completely additive arithmetic functions

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In number theory, completely additive arithmetic functions are arithmetic functions \scriptstyle a(n),\, n \,\in\, \N^+, \, such that

a(mn) = a(m) + a(n),\quad m,\, n \in \N^+. \,

Obviously, \scriptstyle a(1) must be 0. An example is Ω(n), the number of prime factors of n.

See also

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