Yes, there are two examples for pi here: http://mattmahoney.net/dc/zpaqutil.html http://mattmahoney.net/dc/zpaqutil.html and one where the input does not exactl

Yes, there are two examples for pi here: http://mattmahoney.net/dc/zpaqutil.html http://mattmahoney.net/dc/zpaqutil.html and one where the input does not exactly have to be pi, but can contain it: https://github.com/pothos/zpaqlpy/blob/master/test/mixedpi2.cfg https://github.com/pothos/zpaqlpy/blob/master/test/mixedpi2.... But of course for real world use cases one would choose a general compression algorithm or write a specific one for a certain type of data you want to handle (because it will perform better than a general algorithm).