Make a square matrix with this shape. For n=4
1 1 0 0
1 0 1 0
0 1 0 1
0 0 1 1
Sums with Excluded Digits
Number of 1s in the Binary Representation of a Number
Better bullseye matrix
Back to basics 20 - singleton dimensions
Sum the Digits of a Number
Altitude of locations on the earth
Derivative of polynomial
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