Automata, Computability and Complexity: Theory & Applications - Part I - Chapter 4

Automata, Computability, and Complexity: Theory and Applications by Elaine Rich

Fermat Numbers

The history of Fermat numbers
The distributed effort to find factors of Fermat numbers

The 15-Puzzle

Karl Hörnell's applet for playing the game
Why not all puzzle instances are solvable

Other puzzles, including Sudoku and Rubik’s Cube

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