Redheffer matrix
Encyclopedia
In mathematics, a Redheffer matrix, studied by , is a (0,1) matrix whose entries aij are 1 if i divides j or if j = 1; otherwise, aij = 0.

The determinant
Determinant
In linear algebra, the determinant is a value associated with a square matrix. It can be computed from the entries of the matrix by a specific arithmetic expression, while other ways to determine its value exist as well...

 of the nxn square Redheffer matrix is given by the Mertens function M(n).

Example

The matrix below is the 12 × 12 Redheffer matrix.
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