Copyright © University of Cambridge. All rights reserved.
'Divisible Palindrome' printed from https://nrich.maths.org/
Palindromic numbers read the same backwards and forwards, e.g. 7227 or 10101.
What is the sum of the digits of the largest 4-digit palindromic number which is divisible by 15?
If you liked this problem,
here is an NRICH task that challenges you to use similar mathematical ideas.