Hi, your logic is correct but 'nchoosek' hogs memory space. there is a better way...
Finding Perfect Squares
Generalized Laguerre polynomials
Easy Sequences 10: Sum of Cumsums of Fibonacci Sequence
Easy Sequences 20: Counting Prime-sided Rectangles
Easy Sequences 1: Find the index of an element
Easy Sequences 37: Natural Factorable Polynomials
Easy Sequences 35: Cutting a donut to Semi-prime pieces
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