It's even crazier than that: Some numbers are illegal to redistribute, because they represent a way to break some copyright, e.g. https://www.cs.cmu.edu/~dst/DeCSS/Gallery/Stego/birkmier-pri... (from https://www.cs.cmu.edu/~dst/DeCSS/Gallery/Stego/index.html)
Also see https://en.wikipedia.org/wiki/DeCSS and https://en.wikipedia.org/wiki/Illegal_number