Problem 59511. Count the ones in a divisibility matrix

ChrisR

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Cody Problem 59506 asked solvers to compute the determinant of matrix consisting of ones in the first column and anywhere the row index divides the column index.
Write a function to count the ones in the matrix. For example, the 4x4 matrix given in the description of Cody Problem 59506 has 11 ones, and the 1000x1000 matrix has 8068. 

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Last Solution submitted on Jul 19, 2026

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