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 Go on, indeed. by Jer)

Jer,

You referred to OEIS!

What's that, twice now?

Posted by broll on 2015-05-12 10:23:17