Is this matrix orthogonal?
Sophie Germain prime
Number of digits in an integer
Kryptos - CIA Cypher Sculpture: Vigenere Encryption
GJam 2014 China Rd A: Maze (Left Hand Rule) Large Arrays
Mandelbrot Number Test [Real+Imaginary]
Skyscrapers - Puzzle
Kaggle: Reverse Game of Life - Single Move to One Cell Case
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