Números de Gödel

Q: How many light bulbs does it take to change a light bulb?
A: One, if it knows its own Goedel number.

Para entenderlo:
# Douglas Hofstadter, 1979. Gödel, Escher, Bach: An Eternal Golden Braid. Vintage Books. ISBN 0465026850. (1999 reprint: ISBN 0465026567).
# Ernest Nagel, James Roy Newman, Douglas R. Hofstadter, 2002 (1958). Gödel's Proof, revised ed. ISBN 0814758169.