Spherical radius given four points
Getting logical indexes
Replace all zeros and NaNs in a matrix with the string 'error'
Chebyshev polynomials of the 2nd Kind
Easy Sequences 41: Boxes with Integer Edges
Easy Sequences 35: Cutting a donut to Semi-prime pieces
Easy Sequences 23: Hat Guessing Game!
Easy Sequences 26: Prime-Integer Line Segments
Easy Sequences 8: Triangles with integer sides and prime perimeters
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