[klodolph]

That’s undoubtedly some redundancy in the underlying data, not in the encoding itself.

[dbaupp]

Yes, the data is the bytes 00, 01, …, FF repeating, and that pattern is highly visible with a power-of-2 encodings, but not visible with other bases (for similar reasons that 0.1 as a (binary) float doesn’t behave as people expect).