Angle between two vectors
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Create an n-by-n null matrix and fill with ones certain positions
There are 10 types of people in the world
Lights Out 4 - 5x5, 8 moves
Rule of mixtures (composites) - upper bound
Scrabble Scores - 7
Divisible by n, prime divisors - 11, 13, 17, & 19
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