El Regreso (song) the famous phrase "cogito ergo sum" (I think, therefore I am) . Today is almost proved that many of the existing people are losing the ability to think and act to solve this and other very similar problems.<br>As already said... "Errare humanum est". El Regreso (song) "El Regreso" (English: "The Return") is the third track from WarCry's "¿Dónde Está La Luz?". "El Regreso" is a well-known song among the band's fans and one of their most controversial ones due to the lyrics referring to revenge from a son to his alcoholic father who abused of him and his mother. "El
Descartes number Descartes number In number theory, a Descartes number is an odd number which would have been an odd perfect number, if one of its composite factors were prime. They are named after René Descartes who observed that the number would be an odd perfect number if only were a prime number, since the sum-of-divisors function for would satisfy, if 22021 were prime, where we ignore the fact that reveals that 22021 is composite. A Descartes number is defined as an odd number where and are coprime and , whence is taken as a 'spoof' prime. The example given is the