KöMaL 2019 K633
Doris thought of an integer, from 3 to 25, inclusive. She told Anna whether the number is a perfect square, whether it is a prime, and whether it is a multiple of 5. From this information, Anna was able to tell which number it was. What may the number be?
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.