MathDB
2024 Alg/NT Problem 1

Source:

April 14, 2024
number theory

Problem Statement

Connor is thinking of a two-digit number nn, which satisfies the following properties:
[*] If n>70n>70, then nn is a perfect square. [*] If n>40n>40, then nn is prime. [*] If n<80n<80, then the sum of the digits of nn is 1414.
What is Connor's number?
Proposed by Connor Gordon