KöMaL 2014 B4669
It is a known fact that 777-headed dragons have either 9 or 13 heads on their necks. Two dragons are considered identical if they have the same number of 9-headed necks. How many different 777-headed dragons are possible?
Official text KöMaL. Quoted with source.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.
Similar problems
These problems have the most words in common with this statement.