Suppose you were to take a variant of efdtt.c, a
program that will allow you to play a DVD on a
computer, and then convert each character in the
code to its 7-bit ascii equivalent (the code contains
standard characters, so the eight or leading bit is zero).
Finally, view this string of bits as a single number.
What do you
get? This illegal prime!
This number was found to be a probable prime by Charles M. Hannum (the original author of efdtt.c) and proven prime by Phil Carmody. [Caldwell]