Determine if a Given Number is a Triangle Number
Is my wife right? Now with even more wrong husband
Clockwise or Counterclockwise
We love vectorized solutions. Problem 1 : remove the row average.
Easy Sequences 40: Quadratic Congruence
Easy Sequences 54: Product of Products of Proper Divisors
Easy Sequences 52: Non-squarable Rectangles
Easy Sequences 47: Boxes with Prime Edges
Easy Sequences 11: Factorial Digits without Trailing Zeros
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