19...96 divisible by 1997 (III Soros Olympiad 1996-97 R1 9.1)
Source:
May 29, 2024
number theory
Problem Statement
In the middle of the number 1996 (i.e. between and ) you need to insert several digits so that the resulting number is divisible by . In this case, you need to get by with the least number of inserted digits.