All the positive perfect squares 1, 4, 9, 16, 25.... are written in strictly ascending order of magnitude and without the commas and spaces, resulting in the following infinite string:

149162536496481100121144......

Reading left to right, what is the 2010^th digit in the above pattern?

(In reply to re: re: Computer verification #2 by Jim Keneipp)

It reserves a space for a sign character, where a blank is equivalent to plus, but a negative number gets an explicit "-" in this position, so, for example positive and negative 4 each get a string of length 2, one being blank and "4" and the other being "-4".

Posted by Charlie on 2010-01-28 17:09:57