It was from some filesystem code. https://news.ycombinator.com/item?id=7296497 https://news.ycombinator.com/item?id=7296497 unsigned three = 1; unsigned fi

It was from some filesystem code. https://news.ycombinator.com/item?id=7296497 https://news.ycombinator.com/item?id=7296497 unsigned three = 1; unsigned five = 5; unsigned seven = 7; These actually get changed through pointers to consecutive powers of 3, 5 and 7 respectively. `three` is initialized to the 0th power of 3, but because only a single 1 is needed by the algorithm, `five` and `seven` are initialized to the 1st powers instead.