> On average, the length of the number required to point to the digit will be the same length as the data you're trying to compress. It would be 0% compression

> On average, the length of the number required to point to the digit will be the same length as the data you're trying to compress. It would be 0% compression in the long run Worse than 0%. The average position of numbers 0000-9999 in pi is 9940, for example. I believe ideally you'd want a De Bruijn sequence (https://en.wikipedia.org/wiki/De_Bruijn_sequence https://en.wikipedia.org/wiki/De_Bruijn_sequence - "optimally short with respect to the property of containing every string of length n at least once") but even that won't get 1:1 compression.