Relevant: - http://en.wikipedia.org/wiki/Illegal_number http://en.wikipedia.org/wiki/Illegal_number - http://en.wikipedia.org/wiki/Illegal_prime http://en.wik

Relevant: - http://en.wikipedia.org/wiki/Illegal_number http://en.wikipedia.org/wiki/Illegal_number - http://en.wikipedia.org/wiki/Illegal_prime http://en.wikipedia.org/wiki/Illegal_prime