The same as the number of twodigit numbers, since the last two digits. must the same as the first two, only reversed. So I'll say there are 100 fourdigit palindromes.
http://wiki.answers.com/Q/How_many_four_digit_pali...

To me this looks s simpler than it seems. Being that the number is four digits long, AND a palindrome, the first and last numbers must be the same. Additionally, the second and third
http://answers.yahoo.com/question/index?qid=201001...

A number is not digits. You could ask how many digits are needed to represent a certain number in base ten, but the question "How many digits is this number?" does not make
http://www.quora.com/Mathematics/Maybeastupidqu...

Among the 900 5 digit palindromes, 93 are prime. Among the
http://www.chacha.com/question/howmany5digitpa...
