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Re:Illegal prime number by peeters on Wednesday July 30, 2014 @10:40AM (#8108420)
http://en.wikipedia.org/wiki/Illegal_number. Illegal prime number is just a minor specialization of the same concept.
Re:Illegal prime number by jacquesm on Wednesday July 30, 2014 @10:42AM (#8108440)
I know illegal number exist, the primes here are different beasts and that's the subject title. If we're going to discuss illegal numbers in general then that's (in my opinion a worthy subject) off-topic for this thread.

Any illegal content can be represented as a number, that's not all that special. Illegal primes took some work to create.