A nice one-liner is always good :)
Most nonzero elements in row
Is A the inverse of B?
Multiply a column by a row
Who invented zero?
sum of first 'n' terms
Chebyshev polynomials of the 2nd Kind
Shifted Hexagonal Tiling Dots in a Circle
Chebyshev polynomials of the 1st Kind
Dots in a Diamond
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