List all perfect square numbers over 1000, employing only 2 different decimal digits.
Example: 88^2=7744 will be on your list.
Ignore trivial solutions like 1 or 4 or 9 followed by an even number of zeroes.
How far can you go?
Known largest solution is
a 10-digit number 6,661,661,161.
The minute and the hour hand of a watch meet every 65 minutes.
How much time does the watch lose or gain ?