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AMC 12 2020b Problem 24

  • Paper

Let D(n)D(n) denote the number of ways of writing the positive integer nn as a productn=f1⋅f2⋯fk,n = f_1\cdot f_2\cdots f_k,where k≥1k\ge1, the fif_i are integers strictly greater than 11, and the order in which the factors are listed matters (that is, two representations that differ only in the order of the factors are counted as distinct). For example, the number 66 can be written as 66, 2⋅32\cdot 3, and 3⋅23\cdot2, so D(6)=3D(6) = 3. What is D(96)D(96)?

(A) 112(B) 128(C) 144(D) 172(E) 184\textbf{(A) } 112 \textbf{(B) } 128 \textbf{(C) } 144 \textbf{(D) } 172 \textbf{(E) } 184

Dataset text AMC 12 2000 to 2025. Quoted with source.

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