Your analysis here is roughly isomorphic to the original presentation. The law doesn't care about the actual bits, except insofar as they represent evidence of

Your analysis here is roughly isomorphic to the original presentation. The law doesn't care about the actual bits, except insofar as they represent evidence of what's really at issue. The law cares that you have some pattern of bits that you laid out with the intent that it represent BAD THING X. If it happens to appear in the digits of PI you've been reading out, you're not at risk. If you go to others saying "You can find the BAD THING at offset XYZ in PI", then that's another matter - you've got the data and the interpretation. On the other hand, if you happen to stumble across one of these primes and don't notice, not a problem. The known "illegal primes" were found specifically by looking for primes that represented illegal things. I'm not convinced that criminalizing possession of data is a good idea, but it's not "under some arbitrary interpretation".