Angle between Two Vectors
Replace multiples of 5 with NaN
Hexagonal numbers on a spiral matrix
Easy Sequences 1: Find the index of an element
Easy Sequences 46: Semi-prime Leap Year Pairs
Easy Sequences 38: Prime Number Delta
Easy Sequences 8: Triangles with integer sides and prime perimeters
Easy Sequences 52: Non-squarable Rectangles
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