Building FizzBuzz in Fractran from the Bottom Up

FRACTRAN is, of course, the delightful esoteric language designed by the recently deceased John Horton Conway.

This blog post writes FizzBuzz in FRACTRAN, but that's just an excuse for an intriguing exploration of the language itself and how to write programs in it in a structured way, then how to write compilers that target FRACTRAN.

[discussion from four years ago: https://news.ycombinator.com/item?id=11894141]