Open Middle®
Directions: Using the digits 0 to 9, at most one time each, place a digit in each box to make the equation true.
Hint
After choosing a value for the first box, think of the remainder that’s needed for the two-digit power and three-digit power.
Answer
Two answers are:
i^2=i^14=i^398
i^3=i^87=i^651
Source: Jason Curley
this is just “find a one digit, two digit and three digit numbers that are all congruent mod 4.”