2011 Lusophon Mathematical Olympiad - Problem 2
Source: 2011 Lusophon Mathematical Olympiad - Problem 2
September 17, 2011
modular arithmeticinequalitiesnumber theory proposednumber theory
Problem Statement
A non-negative integer is said to be squaredigital if it equals the square of the sum of its digits. Find all non-negative integers which are squaredigital.