"Pick a number. Reverse its digits and add the resulting number to the original number. If the result isn't a palindrome, repeat the process. Do all numbers in base 10 eventually become palindromes through this process? Nobody knows.

87 + 78 = 165 165 + 561 = 726 726 + 627 = 1353 1353 + 3531 = 4884, a palindrome." – john walker, "Final Report On The Palindrome Quest".

196 and Other Lychrel Numbers.

update: more mathematical whimsy antville-stylee at math.twoday.net .