16 is the smallest 2-digit square whose digits are non-decreasing.
144 is the smallest 3-digit square whose digits are non-decreasing.
1156 is the smallest 4-digit square whose digits are non-decreasing.

GO ON!

(In reply to re(3): Go on, indeed. by broll)

That comment from back in March was a compliment.  I was referring to the fact that you have made 651 contributions to sequences in the OEIS, whereas I have only made one.  

Posted by Jer on 2015-05-13 10:02:01