Question 196
We say that a positive integer $k$ is *fair* if the number of $2021$-digit palindromes that are a multiple of $k$ is the same as the number of $2022$-digit palindromes that are a multiple of $k$. Does the set $M = \{1, 2, \dots, 35\}$ contain more numbers that are fair or those that are not fair?
(A palindrome is an integer that reads the same forward and backward.)
(David Hruška)
(A palindrome is an integer that reads the same forward and backward.)
(David Hruška)