Fait mathématique: 8340 is a value of n so that (n-1)^{2} + n^{2} + (n+1)^{2} is a palindrome.
Culture générale: 8340 is an unremarkable number.
Date historique: October 31st is the day in 2003 that a bankruptcy court approves MCI's reorganization plans, essentially clearing the telecommunications company to exit bankruptcy.