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Applying the same procedure to a positive integer <math>n</math> produces an expression called the ''doubly recursive factorization'' (DRF) or ''drift'' of <math>n.</math>
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Applying the same procedure to any positive integer <math>n</math> produces an expression called the ''doubly recursive factorization'' of <math>n</math> and notated as <math>\operatorname{drf}(n).</math>
    
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