"An illegal prime is a prime number that represents information which is forbidden to possess or distribute. One of the first illegal primes was discovered in 2001. When interpreted in a particular way, it describes a computer program that bypasses the digital rights management scheme used on DVDs. Distribution of such a program in the United States is illegal under the Digital Millennium Copyright Act.[1] An illegal prime is a kind of illegal number." • #удивительные_факты - × × ×
по странной ассоциации мне это напоминает грег-игановский рассказ Luminous (в смысле там совсем про другое вроде бы) - кот от котов